import java.util.regex.Matcher;
import java.util.regex.Pattern;

class Main
{
  public static void main (String[] args) throws java.lang.Exception
  {
    String a = "XY1XY";
    String b = "XY";
    String c = "";
    Matcher m = Pattern.compile("(.|)" + Pattern.quote(b) + "(?=(.?))").matcher(a);
    for (int i = 1; m.find(); c += m.group(1) + m.group(2), i++);
    System.out.println(c);
  }
}