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.*;

class Main{
	public static void main(String[]args){
		Scanner sc = new Scanner(System.in);
		int tmp;
		for(int i = 1;;i++){
			int x = sc.nextInt();
			int y = sc.nextInt();
			if(x <= 0 && y <= 0){
				break;
			}
			else if(x > y){
				tmp = x;
				x = y;
				y = tmp;
			}
			System.out.println(x+" "+y);
		}
	}
}