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 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);
    	    }
    	        
    	    }
    	}
}