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.

['x', '5259', 'T', 'L', 'C', 'H', '2493', 'u', '3851', '2439', 'U']
14042

['s', 't', 'W', '163', 'v']
163

['3237', '3313', 'a', '213', '5477', 'G', '9221']

21461