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

    while True:

        # Get user response and make sure it's lowercase
        user_response = input(question).lower()

        for item in valid_ans:
            # check if the user response is a word in the list
            if item == user_response:
                return item

            # check if the user response is the same as
            # the first letter of an item in a list
            elif user_response == item[0]:
                return item

        # print error if user does not enter something that is valid
        print(error)
        print()


def instructions():
    """Prints instructions"""

    print("""
*** Instructions ***

Roll the dice and try to win!
    """)



# Main routine

# ask the user if they want instructions (check they say yes/no)
want_instrusctions = string_checker("Do you want to see the instructions? ").lower()

# Display the instructions if the user wants to see them...
if want_instrusctions == "yes":
    instructions()

print()
print("Program continues")