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]: ['r', '3537', 'T', '3611', 'k', '4983', 'h', '4317', '8727', 'E', '6471', '8465', 'f', '5429', 'T', '2169', '2171', 'P', '6941', 'D']
[EX A]: 56821

[EX Q]: ['w', 'I', 't', '813', 'K', '5785']
[EX A]: 6598

[EX Q]: ['8789', 't', '1421', '6389', '9427', '6139', 'x', '9347', 'E', 'e', 'c', '3685', '9031', '4169', '3223', '479', '4519', '5373', '4711', 'H']
[EX A]:
76702