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 Swapping_Two_Numbers
{
    public static void Main()
    {
        while (true)
        {
            string number_str = Console.ReadLine();
            string[] tmp_number = number_str.Split(' ');
            int a = int.Parse(tmp_number[0]);
            int b = int.Parse(tmp_number[1]);

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


            if (a < b)
            {
                int tmp = a;
                a = b;
                b = tmp;
            }

            Console.WriteLine("{0} {1}", a, b);
        }
    }
}