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) Console.WriteLine("{0} {1}", y, x);
                if (x < y) Console.WriteLine("{0} {1}", x, y);
                if (x == y) Console.WriteLine("{0} {1}", x, y);
            }
        }
    }
}