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: ['P', '6161', 'k', '5925', 'h', 'G', 'n']

Answer: 12086


Question: ['c', 'E', 'M', '1303', 'y', 'H']

Answer: 1303


Question: ['Y', 'X', 'd', 'N', '1877', '2865', 'M', '1249', '9385', 'v', 'o', 'P', 'P', '6029']

Answer:
21405