In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.

Ex Input:
['1815', 'U', '869', 's', '1847', 'C', '2711', 'S', 'i', '7949', '4477', '5093', 'D', '8661', '3835', '4087', '73', 'V', '3149', 's']

Ex Output:
44566


Ex Input:
['2469', 'c', '6931', 'a', '2167', '9493', '9403', '4123', '4949', 'R', 'V', 'h', '315', 'T', '9411', 'M', '1329', '8217', '6105', 'Y']

Ex Output:
64912


Ex Input:
['G', 's', 'A', '3543', '2913', 'l', 'H', 's', '1607', '7099', '2679', '5897', '7013', '8567', '9111', 'c', '8531', 'e', 'r']

Ex Output:

56960