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);
		 while(true){
			 int x = sc.nextInt();
			 int y = sc.nextInt();
			 if ( x == 0 && y == 0) break;
			 if (x < y) {
				 System.out.println(String.format("%d %d",x,y));
			 }else {
				 System.out.println(String.format("%d %d",y,x));
			 }
		 }
	 }
	
}