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 abc
{
    class program
    {
        static void Main()
        {
            string [] c;
            int x, y, z;
            c = Console.ReadLine().Split();
            x = int.Parse(c[0]);
            y = int.Parse(c[1]);
            while(x != 0 || y != 0)
            {
                if(x > y)
                {
                    z = x;
                    x = y;
                    y = z;
                }
                Console.WriteLine("{0} {1}", x, y);
                c = Console.ReadLine().Split();
                x = int.Parse(c[0]);
                y = int.Parse(c[1]);
            }
        }
    }
}