Given the class below, what will be the output when new Box(); is executed?

Given the class below, what will be the output when new Box(); is executed?

class Box {
  Box() {
    this(3, 4);
    System.out.print("X");
  }
  Box(int w, int h) {
    this(w, h, 5);
    System.out.print("Y");
  }
  Box(int w, int h, int d) {
    System.out.print("Z");
  }
}