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.*;

class Main {

   public static void main(String[] args) throws Exception {
      Scanner sc = new Scanner(System.in);
      int x = sc.nextInt();
      int y = sc.nextInt();
      int work;
      while (x != 0 || y != 0) {
         if (x < y) {
            work = x;
            x = y;
            y = work;
         }
         System.out.printf("%d %d\n", x, y);
         x = sc.nextInt();
         y = sc.nextInt();
      }
   }
}