#!/usr/bin/env python
# Exercise 12e
# cal command

import argparse
import calendar
from datetime import datetime

calendar.setfirstweekday(calendar.SUNDAY)
parser = argparse.ArgumentParser()
parser.add_argument("-1", "--one", default=1, action="store_true")
parser.add_argument("-3", "--three", default=False, action="store_true")
parser.add_argument("-n", "--months", type=int)
args = parser.parse_args()
past = 3 if args.three else 0
calendars = []


def get_date(i):
    year = datetime.now().year
    month = datetime.now().month
    tmp = month + i
    if tmp < 1 or tmp > 12:
        year += int(tmp / 12)
        month = tmp % 12
        if month == 0:
            year -= 1
            month = 12
        if tmp < 1 and month < 12:
            year -= 1
    else:
        month += i
    return year, month


for i in range(args.months or past or args.one):
    if args.three:
        i -= 1
    year, month = get_date(i)
    calendars.append(calendar.month(year, month))

for i in range(2):
    calendars.append("\n" * 8)

for group in list(zip(*[iter(calendars)] * 3)):
    group = list(map(lambda x: tuple(x.split("\n")), group))
    group = list(zip(*group))
    line_i = 0
    for row in group:
        line = ""
        for col in row:
            spaces = 20 - len(col)
            line += col + "  " + (" " * spaces)
        if len(line.strip()) > 0:
            print(line)
            line_i += 1
    if line_i == 7 and len(calendars) - 2 > 3:
        print()