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.

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

A: 57699
****
Q: ['c', 'd']

A: 0
****
Q: ['X', '9795', '9591', '5895', 'g', '4615', '7083']

A:
36979
****