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.

['b', 'i', '7807', 'g', '1611', '6733', 'V', '561', 'C', '8575', 's', 'E', '8129', 'F']
33416

['j', 'f', '3831', 'B', 'D']
3831

['e', '2031', 'M', 'r', '1751', '2575', '4525', '4065', '419']

15366