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', 'f', '2185', 'N', '6381', '6429', '7499', 'd', '757', 'k', 'k', 'b', 'N', '2697', 'A', '8037']

Answer: 33985


Question: ['901', '1939', '7637', '8863', 'X', '5003', '8791', '4757', 'E', '1525', 'y', '9735']

Answer: 49151


Question: ['5261', '837', '7649', '4099', 'R', '3667', 'g', '8511', '419', 'e', '7781', 'k', 'l']

Answer:
38224