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]: ['7959', '1345', '4605', '6453', 'Q']
[EX A]: 20362

[EX Q]: ['8755', 'A', '2893', '6703']
[EX A]: 18351

[EX Q]: ['E', 'L', '1659', 'o', 'H', 'l', '9159', '1749', '7807', 'E', 'S', 'h', 'W', '8247', 'q', '2531', '9159', '3463', 'u', 'b']
[EX A]:
43774