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 Program
{
    static void Main()
    {
            int i;
            int[] x = new int[3000];
            int[] y = new int[3000];
            for (i = 0; i < 3000; i++)
            {
                string inp = Console.ReadLine();
                string[] data = inp.Split(' ');
                x[i] = int.Parse(data[0]);
                y[i] = int.Parse(data[1]);
                if (x[i] == 0 && y[i] == 0)
                {
                    break;
                }
            }
            for (i = 0; i < 3000; i++)
            {
                if (x[i] == 0 && y[i] == 0)
                {
                    break;
                }
                if (x[i] > y[i])
                {
                    Console.WriteLine("{0} {1}", y[i], x[i]);
                }else
                {
                    Console.WriteLine("{0} {1}", x[i], y[i]);
                }

            }
    }
}