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 x = 0;
        int y = 0;
        for (int i = 1; i > 0; i++)
        {
            string[] xy = Console.ReadLine().Split(' ');
            x = int.Parse(xy[0]);
            y = int.Parse(xy[1]);

            if (x == 0 && y == 0)
                break;
            else if (x > y)
            {
                int tmp = x;
                x = y;
                y = tmp;
            }
            Console.WriteLine("{0} {1}", x, y);
        }
        
    }
}