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) {
		// TODO 自動生成されたメソッド・スタブ
        Scanner scan  = new Scanner(System.in);
		 int x,y;
		 
		 while(true) {
		      x =scan.nextInt();
		      y =scan.nextInt();
		      if (x== 0 && y == 0) break;
		      
		      if (x <= y) {
		      System.out.println(x + " " + y);
		      }
		      else {
		      System.out.println(y + " " + x); 
		      }
		 }	
	}

}