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]: ['K', '479', 'u', '3489', 'o', '9589', '7153', '7649', '123', 'a', 'A', '3951', '847', 'N', 'R', '947', '9243', 'G', 'a']
[EX A]: 43470

[EX Q]: ['187', 'J', 'l', 'p', '1009', 'g', '5817', 'V', 'B', 'Z', '3329', '9253']
[EX A]: 19595

[EX Q]: ['3701', 'b', 'N', '2061', 'S', '2395', '1511', 'q', '4565']
[EX A]:
14233