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: WA: Presentation Error)

<?php
	while (true) {
		$n = trim(fgets(STDIN));
		$n = explode(" ", $n);

		if (!$n[0] && !$n[1]) break;

		sort($n);
		foreach ($n as $m) {
			print "$m ";
		}

		print "\n";
	}