#!/usr/bin/python3
"""万年历"""
import sys
import datetime


def main():
    """获取每月1号是星期几"""
    if len(sys.argv) == 3:
        month = int(sys.argv[1])
        year = int(sys.argv[2])
    else:
        curr_date = datetime.datetime.now()
        month = curr_date.month
        year = curr_date.year

    century = year//100
    year1 = year if month >= 3 else year-1
    month1 = month if month >= 3 else month+12
    year1 = year1%100

    week = year1 + year1//4+ century//4 - 2*century + 26*(month1+1)//10
    day_week = week%7
    print(day_week, year1, month1, century)
    moon = [
        "", "January", "February", "March", "April", "May", "June", "July", "August",
        "September", "October", "November", "December"
        ]
    day1 = 31 if month not in [4, 6, 9, 11] and month != 2 else 30
    day2 = 28 if year / 4 == 0 and year / 100 != 0 else 29
    days = day2 if month == 2 else day1
    print(f'{moon[month]} {year}'.center(20))
    print("Su", "Tu", "We", "Th", "Fr", "Sa", "Wo")
    print('   '*(day_week), end='')
    for day in range(1, days+1):
        print(str(day).rjust(2), end=' ')
        day_week += 1
        if day_week == 7:
            day_week = 0
            print()
    print()

if __name__ == '__main__':
    main()