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]: ['3629', '8785', '9537', '8479', '3523', 'c', 'C', '5093', '2405', 'y', '1145', '8987', 'f']
[EX A]: 51583

[EX Q]: ['r', 'b', 'G', 'H', '255', '6809', '5133', '1059', '4317', 'P', '7219', 'd', '805', 'G', '5243', '8305', '8509', 'o']
[EX A]: 47654

[EX Q]: ['o', '3173', 'G', '1703', '2733', 'n', '6643', '5779', '2777', 'F', '2493', 'X', '6341', 't']
[EX A]:
31642