@@ -0,0 +1,41 @@
+package B1;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.util.StringTokenizer;
+
+public class Boj_23841_데칼코마니 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+        StringBuilder sb = new StringBuilder();
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        int N = Integer.parseInt(st.nextToken());
+        int M = Integer.parseInt(st.nextToken());
+        char[][] result = new char[N][M];
+
+        for (int i = 0; i < N; i++) {
+            String s = br.readLine();
+            for (int j = 0; j < M; j++) {
+                char c = s.charAt(j);
+                if (c != '.') {
+                    result[i][j] = c;
+                    result[i][M - j - 1] = c;
+                } else if (result[i][j] == '\0') {
+                    result[i][j] = c;
+                }
+            }
+            for (int j = 0; j < M; j++) {
+                sb.append(result[i][j]);
+            }
+            sb.append('\n');
+        }
+
+        bw.write(sb.toString());
+        bw.flush();
+    }
+}