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

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

['c', 'd', 'J', 'Z', 'W', '783', '481', '8893', 'n']

10157