def names_by_popularity(names_dict: dict) -> str:
    r"""
    Create a string used to print the names by popularity.

    Format:
        1. name: number of people + "\n"
        ...

    Example:
        1. Kati: 100
        2. Mati: 90
        3. Nati: 80
        ...

    :param names_dict: dictionary of the names (key is name, value is count)
    :return: string
    """
    pass


if __name__ == '__main__':
    example_names = ("Kati:F\n" * 1000 + "Mati:M\n" * 800 + "Mari:F\n" * 600 + "Tõnu:M\n" * 400).rstrip("\n").split(
        "\n")
print(names_by_popularity(male_names))  # ->   1. Mati: 800 #2. Tõnu: 400#(empty line)