from datetime import date, timedelta


def most_frequent_days(a):
    week = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
    days = {"Monday": 0, "Tuesday": 0, "Wednesday": 0, "Thursday": 0, "Friday": 0, "Saturday": 0, "Sunday": 0}
    plus_a_day = timedelta(days=1)
    first_date = date(a, 1, 1)
    last_date = date(a, 12, 31)
    while first_date <= last_date:
        days[week[first_date.weekday()]] += 1
        first_date += plus_a_day
    return [day for day, count in days.items() if count == max(days.values())]


if __name__ == '__main__':
    print("Example:")
    print(most_frequent_days(1084))

    # These "asserts" are used for self-checking and not for an auto-testing
    assert most_frequent_days(1084) == ['Tuesday', 'Wednesday']
    assert most_frequent_days(1167) == ['Sunday']
    assert most_frequent_days(1216) == ['Friday', 'Saturday']
    assert most_frequent_days(1492) == ['Friday', 'Saturday']
    assert most_frequent_days(1770) == ['Monday']
    assert most_frequent_days(1785) == ['Saturday']
    assert most_frequent_days(212) == ['Wednesday', 'Thursday']
    assert most_frequent_days(1) == ['Monday']
    assert most_frequent_days(2135) == ['Saturday']
    assert most_frequent_days(3043) == ['Sunday']
    assert most_frequent_days(2001) == ['Monday']
    assert most_frequent_days(3150) == ['Sunday']
    assert most_frequent_days(3230) == ['Tuesday']
    assert most_frequent_days(328) == ['Monday', 'Sunday']
    assert most_frequent_days(2016) == ['Friday', 'Saturday']
    print("Coding complete? Click 'Check' to earn cool rewards!")