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 (true) {
	$line = readline();
	readline_add_history($line);
	$inputs = explode(" ", $line);
	$a = intval($inputs[0]);
	$b = intval($inputs[1]);
	if (($a == 0) && ($b == 0)) {
		break;
	}
	if ($a < $b) {
		echo "{$a} {$b}", PHP_EOL;
	} else {
		echo "{$b} {$a}", PHP_EOL;
	}
}