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.

['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']
35729

['6941', 'I', 'j', '6135', '6525', '7853', '5607']
33061

['e', 's', 'e', '5977', 'n', '2631', 'Y', '9599', '1383', 'g', '1309', 'e', 'd', '753', 'P']

21652