class calculator:

	@staticmethod
	def add(a,b):
		return a+b

	@staticmethod
	def sub(a,b):
		return abs(a-b)

	@staticmethod
	def mul(a,b):
		return a*b

	@staticmethod
	def div(a,b):
		return a/b
	
	@staticmethod
	def mod(a,b):
		return a%b
