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 ConsoleApp8
{
    class Program
    {
        static void Main(string[] args)
        {
            for(int n = 1; n<3000; n++)
            {
                var A = Console.ReadLine().Split(' ');
               
                int a = int.Parse(A[0]);
                int aa = int.Parse(A[1]);
               
                if(a == 0 && aa ==0)
                {
                    break;
                }
                else if(a <= aa)
                {
                    Console.WriteLine("{0} {1}",a,aa);
                }
                else if(a >=aa)
                {
                    Console.WriteLine("{0} {1}", aa, a);
                }
            }

        }
    }
}