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 AOJ.intro
{
    namespace ITP_1_3_C
    {
        public static class SwappingTwoNumbers
        {
            public static void Main()
            {
                // テストケース入力部
                for (int i = 0; i < 3000; ++i)
                {
                    string[] test = Console.ReadLine().Split();
                    var inputDataX = int.Parse(test[0]);
                    var inputDataY = int.Parse(test[1]);
                    if (inputDataX == 0 && inputDataY == 0)                  
                    {
                        break;
                    }
                    else if (inputDataX != 0 || inputDataY != 0)
                    {
                        Console.WriteLine("{0} {1}", Math.Min(inputDataX, inputDataY), Math.Max(inputDataX, inputDataY));
                    }
                }
            }
        }

    }
}