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;

namespace test
{
	class program
	{
		static void Main()
		{
			while (true)
			{
				string[] str = Console.ReadLine().Split(' ');
				int x = int.Parse(str[0]);
				int y = int.Parse(str[1]);
				if (x == 0 && y == 0) break;
				if (x > y) { int temp = x;  x = y;	y = temp; }
				Console.WriteLine(x + " " + y);
			}
		}
	}
}