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 PHP (judge verdict: Wrong Answer)

<?php
    while(1){
    fscanf(STDIN,"%d %d",$x,$y);
        if( $x == 0 && $y == 0 ){
                break;
        }else if( $x > $y ){
            echo $y." ".$x;
        }else{
            echo $x." ".$y;
        }
    }
?>