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', 'f', 'p', 'R', 'N']
0

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

['E', '3343', 'W', 'S', 'L', '2991', '349', '5979', 'S', 'p', 'd', 'C', '7891', 'h', 'r', 'C', 'g']

20553