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 OJcsharp
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] x = new int[10000];
            int[] y = new int[10000];
            int count = 0;
            do
            {
                //input
                string[] str = Console.ReadLine().Split(' ');
                x[count] = int.Parse(str[0]);
                y[count] = int.Parse(str[1]);
                //swap
                if (x[count] > y[count])
                {
                    int t = y[count];
                    y[count] = x[count];
                    x[count] = t;
                }
                //
                count++;
            } while (x[count-1] != 0 && y[count-1] != 0);
            for (int n = 0; n < count - 1; n++)
            {
                Console.WriteLine(x[n] + " " + y[n]);
            }
        }
    }
}