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: ['w', 'I', 't', '813', 'K', '5785']

Answer: 6598


Question: ['X', 'f', 'p', 'R', 'N']

Answer: 0


Question: ['8133', '2395', 'E', 'c', '1565', 'G', '7491', '5171', 's', 'K', 'm', '4999']

Answer:
29754