Computer Science- Python

Question

I need help with this sample output line and how to code it thank you

User Input

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

Answer 1

planChStr="?"

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

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

planChStr = planChStr.upper()

print(planChStr)