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;
import java.io.*;


class Main {
	public static void main(String args[]) {
	    Scanner sc = new Scanner(System.in);
	    while( true ){
	    	String s1 = sc.next();
	    	int x = Integer.parseInt(s1);
	    	String s2 = sc.next();
	    	int y = Integer.parseInt(s2);
	    	if( x == 0 && y == 0){
	    		break;
	    	}
	    	if( x < y ){
	    	    System.out.println( x + " " + y );
	    	}
	    	else{
	    		System.out.println( y + " " + x );
	    	}
	    }
	}
}