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: Time Limit Exceeded)

using System;
using System.Collections.Generic;

using System.Text;


namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            int n =1;
            while(true)
            {
                string s =Console.ReadLine();
                if(s == "0")
                {break; }

                 Console.WriteLine("Case" +n+": "+s);
                 n++;
            }


            

         
           

       

           //  for (int i = 0; i < 1000; i++)
           //{
           //     Console.WriteLine("Hello World"); }

            

        }

          
    }
}