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;
using System.Linq;

namespace AizuOnlineJudgement.ITP1_3_C
{
	public static class Program
	{
		public static void Main (string[] args)
		{
			for (; ; )
			{
				var xy = Console.ReadLine ().Split (' ').Select (s => int.Parse (s)).ToArray ();
				if (xy[0] + xy[1] == 0)
				{
					break;
				}
				Console.WriteLine (string.Format (xy[0] < xy[1] ? "{0} {1}" : "{1} {0}", xy[0], xy[1]));
			}
		}
	}
}