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.

[EX Q]: ['3013', '3955', 'f', '1183', '5111', '9509', '2351', '7087', 'f']
[EX A]: 32209

[EX Q]: ['6723', '1', '6357', '1497', 'A', 'p', 'N', 'T']
[EX A]: 14578

[EX Q]: ['P', '521', '5667', '125', '9875', 'u', 'L', 'n', 'G', '4071', '8201', '4009', 'h', '8881', '1521', 'U', 'f', '7719']
[EX A]:
50590