# from lab23 import is_year_leap

def is_year_leap(year):
    if year % 4 == 0:
        return True
    else:
        return False

def days_in_month(year, month):

    days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

    if is_year_leap(year) == True:
        days[1] = 29

    return days[month - 1]

test_years = [1901, 2000, 2016, 1987]
test_months = [2, 2, 1, 11]
test_results = [28, 29, 31, 30]

for i in range(len(test_years)):
    yr = test_years[i]
    mo = test_months[i]

    print(yr, mo, "->", end="")
    result = days_in_month(yr, mo)
    if result == test_results[i]:
        print("OK")
    else:
        print("Failed")