#Check that users enmter a valid
#option based on a list
def string_checker(question, valid_ans=("yes", "no")):
    error = f"Please enter a option from the following list: {valid_ans}"

    while True:
        #Get user response and make sure it is lowercase
        user_response=input(question).lower()
        for item in valid_ans:
            # check if the users response is a word in the list
            if item==user_response:
                return item
            #check if the users response is the same as
            #the first letter of a item in the list
            elif user_response==item[0]:
                return item

        #Print error f user does not enter a valid response
        print(error)
        print()



#Main routine goes here
rps_list = ["rock", "paper", "scissors", "xxx"]

want_instructions = string_checker("Do you want to see the instructions?")
print("you chose the following:", want_instructions)

user_choice=string_checker("Choose one of the following:", rps_list)
print("You chose the following:", user_choice)