@@ -0,0 +1,41 @@
+package backjoon;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+// https://www.acmicpc.net/problem/10809
+// 알파벳 찾기
+
+public class _10809 {
+
+  public static void main(String[] args) throws IOException {
+    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    int[] arr = new int[26];
+    for(int i = 0; i < arr.length; i++) {
+      arr[i] = -1;
+    }
+
+    String s = br.readLine();
+    for(int i = 0; i < s.length(); i++) {
+      char ch = s.charAt(i);
+      // arr 원소 값이 -1 인 경우에만 초기화
+      if(arr[ch - 'a'] == -1) {
+        arr[ch - 'a'] = i;
+      }
+    }
+
+    for(int val : arr) {	// 배열 출력
+      System.out.print(val + " ");
+    }
+
+  }
+}
+/*
+input
+baekjoon
+
+output
+1 0 -1 -1 2 -1 -1 -1 -1 4 3 -1 -1 7 5 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
+ */