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.

['2975', '33', '2845', '4695', 'j', '607', 'e', 'z', '6339', '1899', 'q', 'O']
19393

['1395', '3605', '6001', 's', 'h', 'T', 'K', 'X', '9413', 'X', '5099', 'c', 'f', 't', 'S', 'f', '4651']
30164

['H', 'n', '9317', 'C', 'W', 'x']

9317