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: ['8529', '2657', '1599', 'b', '8187', '7005', '7481']

Answer: 35458

Question: ['8109', '5635', 'u', 'M', '1009']

Answer: 14753

Question: ['6099', '7751', '367', '859', 'p', 'T', '8211', 'F', '6003', 't', '8745', '2755', 'R']

Answer:
40790