#!/usr/bin/python3
def add_tuple(tuple_a=(), tuple_b=()):

    new_a = tuple_a
    new_b = tuple_b

    if (len(tuple_a) == 0):
        new_a = (0, 0)
    elif (len(tuple_a) == 1):
        new_a = (tuple_a[0], 0)

    if (len(tuple_b) == 0):
        new_b = (0, 0)
    elif (len(tuple_b) == 1):
        new_b = (tuple_b[0], 0)

    a = new_a[0] + new_b[0]
    b = new_a[1] + new_b[1]
    result = (a, b)

    return (result)
