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 Program
{
	static void Main(string[] args)
	{
		var outputVal = new System.Text.StringBuilder(10000);

		bool isContinue = false;
		int a, b = 0;
		do {
			string[] inputVal = Console.ReadLine().Split(' ');
			int temp = 0;
			a = int.Parse(inputVal[0]);
			b = int.Parse(inputVal[1]);
			if (a > b) { temp = a; a = b; b = temp; }
			isContinue = a != 0 && b != 0;
			if (isContinue) outputVal.AppendLine(a + " " + b);
		} while (isContinue);

		Console.Write(outputVal.ToString());
	}
}