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.

['4437', '1265', '1519', 'K', 'Q', 'b', 'n', 'J', '6631', 'K', 'q', 'D', 'U', 'u', '3653', '5169', 'L', 's']
22674

['4515', '3911', 'M', 'T', 'w', 'F']
8426

['1923', '8307', 'F', '7395', '4489', 'u', '2105', 'F', '5419', 'q', '9433', '6991', '2759']

48821