def main():
    text = input("Text: ")

    letters = get_letters(text)
    words = len(text.split())
    sentences = get_sentences(text)

    index = round(0.0588 * (100 * letters / words) - 0.296 * (100 * sentences / words) - 15.8)

    if (index < 1):
        print("Before Grade 1")

    elif (index >= 16):
        print("Grade 16+")

    else:
        print(f"Grade {index}")


def get_letters(text):
    count = 0
    for i in range(len(text)):
        if (text[i].isalpha()):
            count += 1
    return count


def get_sentences(text):
    count = 0
    for i in range(len(text)):
        if (text[i] == '.' or text[i] == '!' or text[i] == '?'):
            count += 1
    return count


main()