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;

class Program
{
	static void Main()
	{
		string s;
		while ((s = Console.ReadLine()) != "0 0")
		{
			string[] a = s.Split(' ');
			if (Int32.Parse(a[0]) < Int32.Parse(a[1]))
			{
				Console.WriteLine("{0} {1}", a[0], a[1]);
			}
			else
			{
				Console.WriteLine("{0} {1}", a[1], a[0]);
			}
		}
	}
}