def change_time(input_time):
    year = input_time.split(',')[-1].strip()
    month = str(list(calendar.month_abbr).index(input_time.split(' ')[0]))

    if int(month) < 10:
        month = '0' + str(month)

    day = int(input_time.split(',')[0].split(' ')[-1])
    if day < 10:
        day = '0' + str(day)
    get_day = str(year) + '-' + str(month) + '-' + str(day)

    return get_day
    
change_time(Aug 15,2021)