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

['i', 'o', '1321', 'I', 'W', 'e', '1201', 'I', 'e', 'F', '9841', 'm', '9827', 'q', 'f', 'X', '8261']
30451

['6877', '521', '851', '1761', 'Q']

10010