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]: ['w', '8035', 'J', '2671', '7509', '1573', '6915', '8569', '345', 'T', 'P', 's', '1341', '7823', '8671', 'm', 'Q', 's', 'N']
[EX A]: 53452

[EX Q]: ['2663', 'l', '7863', 'Y', '6965', '5979', '8895', '9501', '1321', 'K', '7921', 'q', '8701', 'K', '1839', 'U', 'G', '7867', 'd']
[EX A]:
69515