import java.util. *;
import java.lang. *;
import java.io. *;
import java.io.PrintStream;
import java.math.BigInteger;
 
class Ideone
{
    static String XOR (String _str_one, String _str_two) {
      BigInteger i1 = new BigInteger (_str_one, 16);
      BigInteger i2 = new BigInteger (_str_two, 16);
      BigInteger res = i1.xor (i2);
      String result = res.toString (16);
      return result;
    }
	public static void main (String [] args) throws java.lang.Exception
	{
          String str_one = "4b64ca12ace755516c178f72d05d7061";
          String str_two = "ecd44646cfe5994ebeb35bf922e25dba";
          String answer = XOR (str_one, str_two);
          System.out.println ("your flag is:" + answer);
 
	}
}

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