#!/usr/bin/python3.8
def sign(x):
	if x<0:
		return'negative'
	elif x>0:
		return'positive'
	else:
		return'zero'
def main():
	for x in [-1,0,1]:
		print(sign(x))
def main():
	while True:
		x+input("δωσε x:")
		x=eval(x)
		if  x>0: break
	while True:
		y=input("δωσε y")
		y=eval(y)
		if y>0: break
	a=add(x,y)
	b=sub(x,y)
	print (f'Add={a}')
	print(f'Sub={b}')
if __name__=="__main__":
	main()