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;

class Tester
{
    static void Main()
    {
        int a, b = 0;

        for(int i=0;i<3000;i++)
        {
            string x = Console.ReadLine();
            string[] result;

            const char Space = ' ';
            char[] delimiters = new char[] { Space };
            result = x.Split(delimiters);

            a = int.Parse(result[0]);
            b = int.Parse(result[1]);

            if (a == 0 && b == 0)
            {
                Environment.Exit(0);
            }

            int small, large;
            if (a < b)
            {
                small = a;
                large = b;
            }
            else
            {
                small = b;
                large = a;
            }
            Console.WriteLine("{0} {1}", small, large);
        }
    }
}