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 Sample
{
	class Program
	{
		static void Main(string[] args)
		{
			while (true)
			{
				var array = Console.ReadLine().Split().Select(s => int.Parse(s)).ToArray();
				var a = array[0];
				var b = array[1];
				if(a == 0 && b == 0)
				{
					break;
				}
				else
				{
					var x = Math.Min(a, b);
					var y = Math.Max(a, b);
					Console.WriteLine($"{x} {y}");
				}
			}
		}
	}
}