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.

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


[Q]: ['2691', '3861', '7087', '4661', '6527']
[A]: 24827


[Q]: ['2093', '2521', '1351', '7931', 'm', '2871', 'L', 'g', 'B', 'I', 'N', 'i', '2249', '8069', '4087', 'u']
[A]:
31172