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;

class Test
{
    public static void Main()
    {
        while(true)
        {
            string s = Console.ReadLine();
            string[] ss = s.Split(' ');
            int x = int.Parse(ss[0]);
            int y = int.Parse(ss[1]);
            
            if(x == 0 && y == 0)
            {
                break;
            }
            
            if(x < y)
            {
                Console.WriteLine(x + " " + y);
            }
            else
            {
                Console.WriteLine(y + " " + x);
            }
            
            
            
            
        }
    }
}