while True:
    input_string = input("Input String: ")

    input_string = input_string.replace('*', '').replace('.', '')
    input_string = '_'.join(input_string.split())
    formatted_string = input_string.lower()

    print(formatted_string)

    repeat = input("Repeat? (Y/N)? ")
    if repeat.upper() == "N":
        print("Bye!")
        break