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.

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

['4685', 'q', 'O', 'o', '3453', 'o', 'Y', 'C', 'a', 'i', '7283', 'J', 'n', 'Q', 'i']
15421

['1189', 'c', '1741', 'm', '3099', 'B', 'd', '6055', 'd', '3965', 'u', 'Y']

16049