def sum(number_one,number_two):
    number_one_int = convert_integer(number_one)
    number_two_int = convert_integer(number_two)

    result = number_one_int + number_two_int

    return result

def convert_integer(number_string):

    converted_integer = int(number_string)
    return convert_integer

answer = sum("1","3")

print(answer)