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: Wrong Answer)

using System;


class MainClass
{
	public static void Main (string[] args)
	{
		while (true) {
			string str = Console.ReadLine ();
			string[] spStr = str.Split (' ');

			int x = int.Parse (spStr [0]);
			int y = int.Parse (spStr [1]);

			if (x > y) {
				int z = x;
				x = y;
				y = z;

			}

			Console.WriteLine (x + " " + y);

			if (x == 0 && y == 0) {
				break;
			}

		}
	}
}