Numbers_converter

text = 'oneoneminustwotwo'
converter = {
    'one':1, 'two':2, 'three':3, 'four':4, 'five':5, 'six':6, 'seven':7, 'eight':8, 'nine':9,
    'plus':'+', 'minus':'-'
}

def words_split(num):
    numbers_given = []
    n = ''
    for i in range(len(num)):
        n += num[i]
        if n in converter:
            numbers_given.append(n)
            n = ''
    return numbers_given

def nums_convert(storage, converter_nums):
    n = ''
    for i in range(len(storage)):
        n += str(converter_nums[storage[i]])
    return n

def numbers_splitting_by_sides(number):
    result = ''
    if "+" in number:
        num = number.split("+")
        left_side = int(num[0])
        right_side = int(num[1])
        result = str(left_side + right_side)
    elif "-" in number:
        num = number.split("-")
        left_side = int(num[0])
        right_side = int(num[1])
        result = str(left_side - right_side)
    return result

def get_key(val):
    for key, value in converter.items():
        if val == value:
            return key
    return "key doesn't exist"

def calculating_number(n):
    final_result = ''
    for el in n:
        if el.startswith("-"):
            final_result += "negative"
            continue
        final_result += get_key(int(el))
    return final_result

numbers_storage = words_split(text)
converted_numbers = nums_convert(numbers_storage, converter)
splitted_numbers= numbers_splitting_by_sides(converted_numbers)
result = calculating_number(splitted_numbers)
print(result)