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: Wrong Answer)

import java.util.Scanner;
class Main
 {
   public static void main(String[] args)
      {
   Scanner S = new Scanner(System.in);

      while(true){

      int a = S.nextInt();
      int b = S.nextInt();

      if(a < b){
      System.out.printf("%d %d",a, b);
              }
      else {
      System.out.printf("%d %d",b, a);
           }
      if (a == 0 && b ==0)break;
      }
 }
}