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.

['5749', 'l', '3297', '8913', '4625', 'M', 'X', 'g', '3143', 'i', '8369', '6101', 'w', '3683', '3891', '1399', '9105', '6923', 'K']
65198

['A', '9979', '8723', '1131', 'i', 'p', 'M']
19833

['8683', 'p', '47', '8983', 'g', 'u']

17713