Problem:
Swapping Two Numbers

Write a program which reads two integers x and y, and prints them in ascending order.

Input

The input consists of multiple datasets. Each dataset consists of two integers x and y separated by a single space.

The input ends with two 0 (when both x and y are zero). Your program should not process for these terminal symbols.

Output

For each dataset, print x and y in ascending order in a line. Put a single space between x and y.

Constraints

0 ≤ x, y ≤ 10000

the number of datasets ≤ 3000

Sample Input

3 2
2 2
5 3
0 0

Sample Output

2 3
2 2
3 5

Solution in JAVA (judge verdict: Wrong Answer)

import java.util.Scanner;
public class Main {
    void swap(){
        int x,y;
        Scanner s = new Scanner(System.in);
        x = s.nextInt();
        y = s.nextInt();
        while(x != 0 && y != 0){
            if(x < y){
                System.out.println(x + " " + y);
            }else{
                System.out.println(y + " " + x);
            }
            x = s.nextInt();
            y = s.nextInt();
        }
    }
    public static void main(String args[]){
        Main m = new Main();
        m.swap();
    }
}