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.*;

public class Main {
    public static void main(String[] args) throws Exception {
Scanner sc = new Scanner(System.in);

		for( ; ; ){
		int x = sc.nextInt();
		int y = sc.nextInt();
	    if(x==0 && y==0) {
	    	break;
	        }
		
		if(x<y)
            System.out.println(x+" "+y);
	    else
	        System.out.println(y+" "+x);
        }

        
        
    }
}