# Print the calendar for a month in a year 
def printMonth(year, month): 
    # Print the headings of the calendar
    printMonthTitle(year, month)

    # Print the body of the calendar
    printMonthBody(year, month)
  
# Print the month title, e.g., May, 1999
def printMonthTitle(year, month): 
    print("         ", getMonthName(month), " ", year)
    print("-----------------------------")
    print(" Sun Mon Tue Wed Thu Fri Sat")

# Print month body 
def printMonthBody(year, month): 
    # Get start day of the week for the first date in the month
    startDay = getStartDay(year, month)

    # Get number of days in the month
    numberOfDaysInMonth = getNumberOfDaysInMonth(year, month)

    # Pad space before the first day of the month
    i = 0
    for i in range(startDay):
       print("    ", end = "")

    for i in range(1, numberOfDaysInMonth + 1):
        print(format(i, '4d'), end = "")

        if (i + startDay) % 7 == 0:
            print() # Jump to the new line

# Get the English name for the month
def getMonthName(month): 
    if month == 1:
        monthName = "January"
    elif month == 2:
        monthName = "February"
    elif month == 3:
        monthName = "March"
    elif month == 4:
        monthName = "April"
    elif month == 5:
        monthName = "May"
    elif month == 6:
        monthName = "June"
    elif month == 7:
        monthName = "July"
    elif month == 8: 
        monthName = "August"
    elif month == 9:
        monthName = "September"
    elif month == 10:
        monthName = "October"
    elif month == 11:
        monthName = "November"
    else:
        monthName = "December"

    return monthName

# Get the start day of month/1/year 
def getStartDay(year, month): 
    START_DAY_FOR_JAN_1_1800 = 3

    # Get total number of days from 1/1/1800 to month/1/year
    totalNumberOfDays = getTotalNumberOfDays(year, month)

    # Return the start day for month/1/year
    return (totalNumberOfDays + START_DAY_FOR_JAN_1_1800) % 7

# Get the total number of days since January 1, 1800
def getTotalNumberOfDays(year, month): 
    total = 0

    # Get the total days from 1800 to 1/1/year
    for i in range(1800, year):
        if isLeapYear(i):
            total = total + 366
        else:
            total = total + 365

    # Add days from Jan to the month prior to the calendar month
    for i in range(1, month):
        total = total + getNumberOfDaysInMonth(year, i)

    return total

# Get the number of days in a month
def getNumberOfDaysInMonth(year, month): 
    if (month == 1 or month == 3 or month == 5 or month == 7 or
        month == 8 or month == 10 or month == 12):
        return 31

    if month == 4 or month == 6 or month == 9 or month == 11:
        return 30

    if month == 2:
        return 29 if isLeapYear(year) else 28

    return 0 # If month is incorrect

# Determine if it is a leap year
def isLeapYear(year): 
    return year % 400 == 0 or (year % 4 == 0 and year % 100 != 0)

def main():
    # Prompt the user to enter year and month 
    year = int(input("Enter full year (e.g., 2001): "))
    month = int(input(("Enter month as number between 1 and 12: ")))

    # Print calendar for the month of the year
    printMonth(year, month)
 
main() # Call the main function