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 C# (judge verdict: Accepted)

using System;

public class Test
{
	static public void Main( )
	{
		while( true ) {
		string[] xy = Console.ReadLine().Split( ' ' );
		
		if( "0" == xy[0] && "0" == xy[1] ) { break; }
		
		var x = int.Parse( xy[0] );
		var y = int.Parse( xy[1] );
		
		if( y < x ) {
			int t = x;
			x = y;
			y = t;
		}
		
		Console.WriteLine( "{0} {1}", x, y );
		}
	}
}