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
	$output = array();
	while( true ) {
		fscanf( STDIN, "%d%d", $x, $y );
		if( 0 == $x and 0 == $y ) { break; }
		if( $y < $x ) {
			$t = $x;
			$x = $y;
			$y = $t;
		}
		array_push( $output, $x." ".$y );
	}
	print implode( "\n", $output );
?>