#!/usr/bin/python3.8
from functools import reduce
def calc_str(mstr):
	ml=mstr.split(",")
	try:
		nl=[eval(x) for x in ml]
	except Exception as e:
		print (str(e))
		return None 
	return reduce(lambda x,y:x+y,nl)
	
def main():
	mstr=input('Δωσε εγγραφη')
	ns=calc_str(mstr)
	print (ns)

if __name__=="__main__":
	main()