class Date:
	# Constructor
	def __init__(self, month, day, year):
		self._month = month
		self._day = day
		self._year = year

	def leap_year(self):
		return ((self._year%4 == 0) and not (self._year%100 == 0 and self._year%400 != 0))

	# Returns the Date object one day after self
	def tomorrow(self):
		pass

	# Returns the Date object obtained by adding ndays to self
	def add(self,ndays):
		pass

	# Returns True if self is after d
	def after(self,d):
		pass

	# Returns True if self is same as d
	def equals(self,d):
		pass

	# Returns True if self is before d
	def before(self,d):
		pass

	# Returns the number of days between self and d
	def days_between(self,d):
		pass

	def __str__(self):
		pass