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 aoj3c
{
    class Program
    {
        static void Main(string[] args)
        {
            for(int i = 1; i < 1001; i++)
            {
                string str = Console.ReadLine();
                string[] num = str.Split(' ');
                int a = int.Parse(num[0]);
                int b = int.Parse(num[1]);

                if(a == 0 && b == 0)
                {
                    break;
                }

                if(a > b)
                {
                    Console.WriteLine(b + " " + a);
                }
                else
                {
                    Console.WriteLine(a + " " + b);
                }

            }
        
        }
    }
}