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Николя убежден, что София звонит домой слишком много и у нее большие счета за звонки. Он собрал счета звонков Софии за последние несколько дней и хочет посчитать сколько потратила София на разговоры.

Счет представлен в виде массива, содержащего информацию о звонках. Помогите...


2014-01-01 01:12:13 181
2014-01-02 20:11:10 600
2014-01-03 01:12:13 6009
2014-01-03 12:13:55 200
Первый день -- 181с≈4м -- 4 монеты;
Второй день -- 600с=10м -- 10 монет;
Третий день -- 6009с≈101м + 200с≈4м -- 100 + 5 * 2 = 110 монет;
Всего -- 124 монеты.

Входящие данные: Информация о звонках в виде кортежа(tuple) строк(strings).

Исходящие данные: Общая сумма звонков в виде целого числа(integer).


total_cost(("2014-01-01 01:12:13 181",
            "2014-01-02 20:11:10 600",
            "2014-01-03 01:12:13 6009",
            "2014-01-03 12:13:55 200")) == 124

Как это можно использовать: Это задание научит работать с различными типами даты. Иногда полная дата не нужна и нужно оперировать только с необходимыми фрагментами даты.

Предусловия: 0 < len(calls) ≤ 30
0 < call_duration ≤ 7200
Счет отсортирован по дате.

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