백준 1343

import java.io.BufferedReader;
import java.io.InputStreamReader;

class Main1343 {
   //https://www.acmicpc.net/problem/1343

   private static final String A = "AAAA";
   private static final String B = "BB";

   public static void main(String[] args) throws Exception {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      String input = br.readLine();

      while (input.contains("XXXX")) {
         input = input.replaceFirst("XXXX", A);
      }

      while (input.contains("XX")) {
         input = input.replaceFirst("XX", B);
      }

      if (input.contains("X")) {
         System.out.println(-1);
         return;
      }

      System.out.println(input);
   }

}