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;

    class Program
    {
        static void Main()
        {
            while (true)
            {
                string[] str = Console.ReadLine().Split(' ');
                if (int.Parse(str[0])== 0 && int.Parse(str[1]) == 0)
                {
                    break;
                }
                if(int.Parse(str[0])>int.Parse(str[1]))
                {
                    var a = str[0];
                    str[0]= str[1];
                    str[1] = a;
                    Console.WriteLine("{0} {1}", str[0],str[1]);
                }
                
            }
        }
    }