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
{
    public static int Main()
    {
        var str = Console.ReadLine();
        var x = int.Parse(str.Split(' ')[0]);
        var y = int.Parse(str.Split(' ')[1]);

        if (x > y)
        {
            Console.WriteLine("{0} {1}", y, x);
        }
        else
        {
            Console.WriteLine("{0} {1}", x, y);
        }

        return 0;
    }
}