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.
--------
Question: ['a', 'm', '3205', '1869', '1117', 'K', '5785']

Answer: 11976


Question: ['R', 'C', 'S', 'x', '1529', 'r']

Answer: 1529


Question: ['o', 'L', '4781', '3065', '7211', 'r', 'T', '4497', 'E', '3079', 'c', '9835', 'N', '2463', 'S', '7249']

Answer:
42180