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: ['1875', '9833', 'i', '7493', 'J', 'P', 'z']

Answer: 19201


Question: ['Z', 'w', 'M', '2233', '5275', '5277', 's', '971', '7085', '6259', 'V', 'E', '4923', '7365', 'c', 'd', 'c', 'U', 'P']

Answer: 39388


Question: ['N', '3851', '8715', 'C', 'k', 'K', 'C', 't', '847', 'T', 'v', '1805', 'Q']

Answer:
15218