Display the first days of each month Program code:

# Prompt the user to enter the year and the first day of the year
year = int(input("Enter the year: "))
firstDay = int(input("Enter the first day (1-7, where 1 is Monday and 7 is Sunday): "))

# Create a list of month names
months = [
    "January", "February", "March", "April",
    "May", "June", "July", "August",
    "September", "October", "November", "December"
]

# Create a list of days of the week
daysOfWeek = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]

# Display the first day of each month
for month in range(1, 13):
    # Display the first day of the current month
    print(months[month-1] + " 1, " + str(year) + " is a " + daysOfWeek[firstDay-1])

    # Calculate the number of days in the current month
    if month == 2:  # February
        if (year % 4 == 0 and year % 100 != 0) or year % 400 == 0:
            daysInMonth = 29  # Leap year
        else:
            daysInMonth = 28
    elif month in [4, 6, 9, 11]:  # April, June, September, November
        daysInMonth = 30
    else:
        daysInMonth = 31

    # Update the first day for the next month
    firstDay = (firstDay + daysInMonth) % 7

Executed Output:

Enter the year: 2013
Enter the first day (1-7, where 1 is Monday and 7 is Sunday): 2
January 1, 2013 is a Tuesday
February 1, 2013 is a Friday
March 1, 2013 is a Friday
April 1, 2013 is a Monday
May 1, 2013 is a Wednesday
June 1, 2013 is a Saturday
July 1, 2013 is a Monday
August 1, 2013 is a Thursday
September 1, 2013 is a Sunday
October 1, 2013 is a Tuesday
November 1, 2013 is a Friday
December 1, 2013 is a Sunday