diff --git a/caucsejunseo/README.md b/caucsejunseo/README.md
index 2267737..be2a730 100644
--- a/caucsejunseo/README.md
+++ b/caucsejunseo/README.md
@@ -10,3 +10,4 @@
  | 6차시 | 2025.04.06 |   큐    | [앵무새](https://www.acmicpc.net/problem/14713)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/23|
  | 7차시 | 2025.04.10 |  그리디  | [폴리오미노](https://www.acmicpc.net/problem/1343)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/28|
  | 8차시 | 2025.04.11 | 연결리스트| [키로거](https://www.acmicpc.net/problem/5397)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/30|
+
diff --git "a/caucsejunseo/\352\267\270\353\246\254\353\223\234/2025.04.10.\355\217\264\353\246\254\354\230\244\353\257\270\353\205\270.c" "b/caucsejunseo/\352\267\270\353\246\254\353\223\234/2025.04.10.\355\217\264\353\246\254\354\230\244\353\257\270\353\205\270.c"
new file mode 100644
index 0000000..3d8a2e4
--- /dev/null
+++ "b/caucsejunseo/\352\267\270\353\246\254\353\223\234/2025.04.10.\355\217\264\353\246\254\354\230\244\353\257\270\353\205\270.c"
@@ -0,0 +1,50 @@
+#define _CRT_SECURE_NO_WARNINGS
+#include<stdio.h> 
+#include <string.h>
+
+#define MAX 51
+#define OUTPUT_MAX 500
+
+int main()
+{
+    char str[MAX];
+    scanf("%s", str);
+
+    char div[MAX] = { 0 };
+    char result[OUTPUT_MAX] = { 0 };  // 결과 저장용
+    int res_index = 0;
+    int i = 0, j = 0;
+    int len1 = strlen(str);
+
+    for (i = 0; i <= len1; i++)
+    {
+        if (str[i] == '.' || str[i] == '\0')
+        {
+            int len2 = strlen(div);
+
+            if (len2 % 2 != 0) {
+                printf("-1\n");
+                return 0; // 중간에 오류 발생 시 즉시 종료
+            }
+
+            for (int k = 0; k < len2 / 4; k++)
+                strcat(result, "AAAA");
+            for (int k = 0; k < (len2 % 4) / 2; k++)
+                strcat(result, "BB");
+
+            if (str[i] == '.')
+                strcat(result, ".");
+
+            memset(div, 0, sizeof(div));
+            j = 0;
+        }
+        else
+        {
+            div[j++] = str[i];
+        }
+    }
+
+    printf("%s\n", result);  // 모든 구간 처리 후 출력
+
+    return 0;
+}