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.Drawing;
using System.Linq;
using System.Text.RegularExpressions;
using System.Text;


namespace aizu
{
	public class EntryPoint
	{
		public static int[] Split(string line)
		{
			return Regex.Split(line, " ").Select(x => int.Parse(x)).ToArray();
		}
		public static void Main()
		{
//			var line = Console.ReadLine();
			
//			var v = Split(line);
			
			
			for (int i = 1; true; i++)
			{
				var line = Console.ReadLine();
				var v = Split(line);
				
				if (0 == v[0] && 0 == v[1]) break;
				
				if (v[0] > v[1])
				{
					var t = v[0];
					v[0] = v[1];
					v[1] = t;
				}
				
				Console.WriteLine(string.Format("{0} {1}", v[0], v[1]));
			
			}

			
			
		}
	}


}