Python Code- Beginner

Question

I need help with this sample output line and how to code it thank you and only using capital letters no lowercase and no numbers.

User Input

Enter your plan letter (A, B, or C):

Answer 1

Assuming you want a way to control user input to be only A, B, or C and only uppercase. You could write it in a loop like so:

case_check = False

while not case_check:

answer = input("Enter your plan letter (A, B, C):")

if answer.upper() in ['A', 'B', 'C']:

case_check = answer.isupper()

Answer 2

charStrPlan = "?"

while (charStrPlan!="A") and (charStrPlan!="B") and (charStrPlan!="C"):

charStrPlan = input("Please input your plan letter (A,B, or C) :> ")

charStrPlan = charStrPlan.upper()

print(charStrPlan)