def space_to_minus(text):
    split_text = text.split(" ")
    return "-".join(split_text)


def reverse_text_till_komma(text):
    text_list = text.split(",")
    text_list[0] = text_list[0][::-1]
    return ",".join(text_list)


def main():
    print(space_to_minus("This is a test"))
    print(reverse_text_till_komma("Hallo,Welt"))


if __name__ == "__main__":
    main()