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

Answer: 1529


Question: ['H', 'i', '8085', 'E', 'q']

Answer: 8085


Question: ['9645', '9147', 'E', 'l', 'S', 'I', '277', 'f', '4727', '9349', '7169', '9747', 'J', '2735', '2893', 'L', '6751', '3203', '6419']

Answer:
72062