from typing import List


def devide_number_to_digits() -> List:
    return [d for d in str(input())]


def is_it_beautiful(input_number: List) -> bool:
    return "4" in input_number and "6" in input_number


if __name__ == "__main__":
    input_number = input()
    if is_it_beautiful(input_number):
        print("Beautiful")
    else:
        print("...")