What is the output of the following code? ```java class X { private int a; private int y; public X() { a = 15; } public X(int y) { this(); X.y = y; System.out.print(this.a + " "); System.out.print(this.y + " "); } } public class Z { public static void main(String[] args) { X x = new X(5); } } ```

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