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;

namespace Test
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            while (true)
            {
                var input = Console.ReadLine().Split(' ');
                if ((input[0] == "0") && (input[1] == "0")) return;
                if (input[0].CompareTo(input[1]) <= 0)
                {
                    Console.WriteLine("{0} {1}", input[0], input[1]);
                }
                else
                {
                    Console.WriteLine("{0} {1}", input[1], input[0]);
                }
            }
        }
    }
}