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;

class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		int x,y;

		while((x = scan.nextInt()) != 0 && (y = scan.nextInt()) != 0){
			if(y < x){
				int tmp = x;
				x = y;
				y = tmp;
			}

			System.out.println(x + " " + y);
		}
	}
}