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.

['3319', 'e', 'c', 'G', '2399', '1557', '4813', 'z', 'U', '4895', 's', '1193', 'A', 'G']
18176

['s', 'd', 't', '8235', '2279', '7477', '3029', '4377', '9153', '4309', '2295', '407']
41561

['8747', 'N', 'M', '4213', 'W', '3917', 'k']

16877