Chap1Q5.py

def numberedDay(firstDay, dayNumber):
    days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
    firstIndex = days.index(firstDay)
    endIndex = (firstIndex + int(dayNumber) - 1) % 7
    return days[endIndex]


year = input("Year: ")
firstDay = input("First day of the year (e.g. 'Monday'): ")
dayNumber = input("Day number: ")
if dayNumber not in range(2,366):
  print("Invalid")
else:
  print(numberedDay(firstDay, dayNumber))