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.

['g', 'A', 'm', '4005', '8079', 'G']
12084

['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']
21509

['e', '1709', 'u', 'u', 'z', 'u', '875', 'v']

2584