#Сергеева, билет № 16

def get_season(string):
    day, month, year = map(int, string.split('.'))
    if day < 1 or day > 31 or month < 1 or month > 12:
        return 'Ошибка в дате'
    if month == 12 or month <= 2:
        return 'Зима'
    elif month >= 2 and month <= 5:
        return 'Весна'
    elif month >= 6 and month <= 8:
        return 'Лето'
    elif month >= 9 and month <= 11:
        return 'Осень'

date_string = "17.15.21, 18.06.56, 2.12.99"
dates = date_string.split(',')

win_count = spr_count = sum_count = aut_count = 0

for date in dates:
    if get_season(date) == 'Зима':
        win_count += 1
    elif get_season(date) == 'Весна':
        spr_count += 1
    elif get_season(date) == 'Лето':
        sum_count += 1
    elif get_season(date) == 'Осень':
        aut_count += 1

print('время года', 'количество', sep='\t')

print('Зима', win_count, sep='\t')
print('Весна', spr_count, sep='\t')
print('Лето', sum_count, sep='\t')
print('Осень', aut_count, sep='\t')