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.

['n', '6729', 'p', 'D', 'o', '1213', 'e', '6951', '2341', '9997', 'e', 'M', 'x', 'R']
27231

['W', '4453', '5895', 'Z', 'A', '7663', '2749', 'f', 'H', '6917', '1215', 'M', '1775', '5397', 'l', '8197', '5209', '8229', 'U']
57699

['1815', 'e', '5415', '8865', '7741', 'E', 'h', 'h', 'E', '6761', '4919', 'G', '1099', 'n', 'X', 'Q', 'h']

36615

