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]: ['X', 'P', 'x', '9471', '5', 'c', 'f', '5077', '1085', '2267', 'R', 'q', '4987', '9529', 'H', 'n', 'r', 'u']
[EX A]: 32421

[EX Q]: ['6347', '5495', '169', '9503', 'H', '571', '6105', 'X', 'r', 'e', '7369', 'a', 'd', '6999']
[EX A]: 42558

[EX Q]: ['8559', '6023', 'T', '5213', 'h', '2259', 'n', '4019', '5363', 'c', 'd', '4147', '1615', 'I', '2275', 'q', 'L', 'p']
[EX A]:
39473