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 ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
            //???????????´??°???????????????
            int i = 0;

            while(true)
            {
                string XY = Console.ReadLine();
                string[] xy = (XY.Split(' '));
                int x = int.Parse(xy[0]);
                int y = int.Parse(xy[1]);

                if(x == 0 && y == 0)
                {
                    break;
                }
                if(i >3000)
                {
                    break;
                }
                if (x < y)
                {
                    Console.WriteLine(xy[0] + " " + xy[1]);
                }
                else
                {
                    Console.WriteLine(xy[1] + " " + xy[0]);
                }
            i++;
            }



        }
    }
}