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)

/* ITP1_3_C */

import java.io.*;
import java.util.*;

public class Main {
  public static void main (String[] args) throws java.lang.Exception {
    // 入力された値をゲット
   Scanner sc = new Scanner(System.in);

   // 入力データがなくなるまで繰り返す
   while (sc.hasNext()) {
     int x = sc.nextInt();  // 1個目をxにセット
     int y = sc.nextInt();  // 1個目をyにセット
           System.out.println(x + " " + y);

     if((x==0)&&(y==0)) {
        // 処理をぬける
        break;
     } else {
       if(x < y) {
           System.out.println(x + " " + y);
       } else {
           System.out.println(y + " " + x);
       }
     }
   }
 }
}