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:

Here is my code:

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

Can anyone please help me to solve it?