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: Accepted)

<?php
while ($line = fgets(STDIN)) {
    $nums = array_map('intval', explode(" ", trim($line)));
    
    if ($nums[0] === 0 && $nums[1] === 0) {
        exit;
    } elseif ($nums[0] < $nums[1]) {
        echo $nums[0]." ".$nums[1].PHP_EOL;
    } else {
        echo $nums[1]." ".$nums[0].PHP_EOL;
    }
}
?>