diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 4a6ed24..ee21498 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,24 +4,8 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="b30e2810-c4c1-4aad-b134-794e52cc1c7d" name="Changes" comment="feat: string to morse">
-      <change afterPath="$PROJECT_DIR$/src/components/options/SimpleRadio.tsx" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/pages/number/index.ts" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/pages/number/sum/index.tsx" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/pages/number/sum/meta.ts" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/pages/number/sum/service.ts" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/pages/number/sum/sum.service.test.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/.eslintrc" beforeDir="false" afterPath="$PROJECT_DIR$/.eslintrc" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/scripts/create-tool.mjs" beforeDir="false" afterPath="$PROJECT_DIR$/scripts/create-tool.mjs" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/components/options/ColorSelector.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/components/options/ColorSelector.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/components/options/RadioWithTextField.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/components/options/RadioWithTextField.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/components/options/ToolOptionGroups.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/components/options/ToolOptionGroups.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/config/uiConfig.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/config/uiConfig.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/pages/home/index.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/home/index.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/pages/string/split/index.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/string/split/index.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/pages/string/to-morse/meta.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/string/to-morse/meta.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/tools/index.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/tools/index.ts" afterDir="false" />
+    <list default="true" id="b30e2810-c4c1-4aad-b134-794e52cc1c7d" name="Changes" comment="feat: sum numbers init">
+      <change beforePath="$PROJECT_DIR$/src/pages/number/sum/service.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/number/sum/service.ts" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -191,15 +175,7 @@
       <workItem from="1719166718305" duration="1783000" />
       <workItem from="1719168519203" duration="17675000" />
       <workItem from="1719197816332" duration="1453000" />
-      <workItem from="1719273044735" duration="8300000" />
-    </task>
-    <task id="LOCAL-00002" summary="feat: initial commit">
-      <option name="closed" value="true" />
-      <created>1718820618078</created>
-      <option name="number" value="00002" />
-      <option name="presentableId" value="LOCAL-00002" />
-      <option name="project" value="LOCAL" />
-      <updated>1718820618078</updated>
+      <workItem from="1719273044735" duration="8486000" />
     </task>
     <task id="LOCAL-00003" summary="feat: initial commit">
       <option name="closed" value="true" />
@@ -585,7 +561,15 @@
       <option name="project" value="LOCAL" />
       <updated>1719277679969</updated>
     </task>
-    <option name="localTasksCounter" value="51" />
+    <task id="LOCAL-00051" summary="feat: sum numbers init">
+      <option name="closed" value="true" />
+      <created>1719281510362</created>
+      <option name="number" value="00051" />
+      <option name="presentableId" value="LOCAL-00051" />
+      <option name="project" value="LOCAL" />
+      <updated>1719281510362</updated>
+    </task>
+    <option name="localTasksCounter" value="52" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -606,7 +590,6 @@
     <option name="CHECK_CODE_SMELLS_BEFORE_PROJECT_COMMIT" value="false" />
     <option name="CHECK_NEW_TODO" value="false" />
     <option name="ADD_EXTERNAL_FILES_SILENTLY" value="true" />
-    <MESSAGE value="chore: idea config" />
     <MESSAGE value="feat: react helmet" />
     <MESSAGE value="feat: tools normalized" />
     <MESSAGE value="feat: search tools" />
@@ -631,7 +614,8 @@
     <MESSAGE value="chore: ResultFooter" />
     <MESSAGE value="feat: change color in png finished" />
     <MESSAGE value="feat: string to morse" />
-    <option name="LAST_COMMIT_MESSAGE" value="feat: string to morse" />
+    <MESSAGE value="feat: sum numbers init" />
+    <option name="LAST_COMMIT_MESSAGE" value="feat: sum numbers init" />
   </component>
   <component name="XSLT-Support.FileAssociations.UIState">
     <expand />
diff --git a/src/pages/number/sum/service.ts b/src/pages/number/sum/service.ts
index 4a013b5..21258b0 100644
--- a/src/pages/number/sum/service.ts
+++ b/src/pages/number/sum/service.ts
@@ -11,7 +11,7 @@ export const compute = (
   extractionType: NumberExtractionType,
   printRunningSum: boolean,
   separator: string
-) => {
+): string => {
   let numbers: number[] = [];
   if (extractionType === 'smart') {
     numbers = getAllNumbers(input);
@@ -22,8 +22,7 @@ export const compute = (
       .filter((part) => !isNaN(Number(part)) && part.trim() !== '')
       .map(Number);
   }
-  return numbers.reduce(
-    (previousValue, currentValue) => previousValue + currentValue,
-    0
-  );
+  return numbers
+    .reduce((previousValue, currentValue) => previousValue + currentValue, 0)
+    .toString();
 };