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.

['n', 'm', 'Y', 'v']
0

['Y', '9053', 'N', '6921']
15974

['9525', '3709', '1241', '4411', 'o', '5959', 'g', '7369', 'K', 'q', 'j', '1601', '1387', '8259', 'Z']

43461