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;


    public static class Program
    {
    static void Main()
    {
        
            while (true)
            {
                var data = Console.ReadLine().Trim().Split(' ');
                var a = int.Parse(data[0]);
                var b = int.Parse(data[1]);
                if (a == 0 && b == 0) break;
                Console.WriteLine("{0} {1}",Math.Min(a,b), Math.Max(a,b));

            }
            
            
        
   
        
       
    }
    }