# -*- coding=utf-8 -*-
# def fact(n):
# print(n)
# if n==1:
# return 1
# return n * fact(n - 1)
# fact(10)
def num(a, b):
a += 1
b -= 1
print("a+b: {}.{}".format(a, b))
if b is 0:
return a, b
return num(a, b)
print(num(1, 1000))