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
$array = array();

while(true){
	$input = array();

	$stdin = trim(fgets(STDIN));
	(int)$input = explode(" ", $stdin);

	if($input[0] == 0 && $input[1] == 0) break;

	sort($input);

	$arrayintarray[] = $input;

}

foreach ($arrayintarray as $value){
	echo("$value[0]".' '."$value[1]"."\r");
	//print("$value[0]".' '."$value[1].");
}
?>