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.

['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']
45451

['1815', 'U', '869', 's', '1847', 'C', '2711', 'S', 'i', '7949', '4477', '5093', 'D', '8661', '3835', '4087', '73', 'V', '3149', 's']
44566

['C', 'j', '6615', '3065', '631', '1009', '4605', 'N', 'o']

15925