def ask_number(question, low, high):
    response = int(raw_input(question))
    while response not in range(low, high):
        response = int(raw_input(question))
    return response
 
def ask_yes_no(question):
    response = (raw_input(question)).lower()
    while response[0] not in ['y', 'n']:
        response = (raw_input(question)).lower()
    return response