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: Accepted)

import java.util.Scanner;

public class  Main{
	public static void main(String[] args) {
		Scanner src = new Scanner(System.in);
		int i = 1;
		
		while(true) {
			int a = src.nextInt();
			int b = src.nextInt();
       
			if((a == 0) && (b == 0)){
				break;
			}else {
				if(a < b) {
					System.out.println(String.format("%d %d",a ,b));
				}else {
					System.out.println(String.format("%d %d",b ,a));
				}
			}
   		}
	}
}