diff --git a/src/features/workbooks/types/workbook_placement.ts b/src/features/workbooks/types/workbook_placement.ts
index 76bd11e11..942fb2a08 100644
--- a/src/features/workbooks/types/workbook_placement.ts
+++ b/src/features/workbooks/types/workbook_placement.ts
@@ -11,11 +11,11 @@ export const SolutionCategory: { [key in SolutionCategoryOrigin]: key } = {
   DYNAMIC_PROGRAMMING: 'DYNAMIC_PROGRAMMING',
   GRAPH: 'GRAPH',
   TREE: 'TREE',
+  STRING: 'STRING',
   NUMBER_THEORY: 'NUMBER_THEORY',
   ALGEBRA: 'ALGEBRA',
   COMBINATORICS: 'COMBINATORICS',
   GAME: 'GAME',
-  STRING: 'STRING',
   GEOMETRY: 'GEOMETRY',
   OPTIMIZATION: 'OPTIMIZATION',
   ANALYSIS: 'ANALYSIS',
@@ -35,11 +35,11 @@ export const SOLUTION_LABELS: Record<string, string> = {
   DYNAMIC_PROGRAMMING: '動的計画法',
   GRAPH: 'グラフ',
   TREE: '木',
+  STRING: '文字列',
   NUMBER_THEORY: '数学（整数論）',
   ALGEBRA: '数学（代数）',
   COMBINATORICS: '数え上げ・確率・期待値',
   GAME: 'ゲーム',
-  STRING: '文字列',
   GEOMETRY: '幾何',
   OPTIMIZATION: '最適化',
   ANALYSIS: '考察・テクニック',