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 Sample1
{
    class Program
    {
        static void Main(string[] args)
        {
            bool notZero = true;
            while (notZero)
            {
                string input = Console.ReadLine();
                int[] numbers = new int[]
                    {
                int.Parse(input.Split(' ')[0]),
                int.Parse(input.Split(' ')[1]),
                    };
                Array.Sort(numbers);
                if (numbers[0] == 0 &&
                    numbers[1] == 0)
                {
                    notZero = false;
                }
                else
                {
                    Console.WriteLine("{0} {1}", numbers[0], numbers[1]);
                }

            }
        }
    }
}