help me plz

[pikapika]

Write a program that asks for a number mark from the user, and shows a letter mark.
mark < 50 F
50 <= mark < 60 D
60 <= mark < 70 C
70 <= mark < 80 B
80 = mark A

[Zren]

Describe what you have tried to solve this problem


Post any relevant code (You may choose to attach the file instead of posting the code if it is too long)