Please help me with the task: Make Upper case not war.

Hello, I’m working on this task:

Write a program that reads 5 chars from the console and then outputs to the console only the uppercase letters, in the same order in which they were entered. Example:
>D
>4
>?
>S
>a
D
S

Here is my code:


namespace CharType
{
   class MakeUpperCaseNotWar
   {
       static void Main(string[] args)
       {
       }
   }
}

Can anyone please help me to solve it?