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.

['4425', 'x', '1959', 'C', 'c', 'D', 'M', '8317', 'q', 'x', '4277', 'N', 'z', 'I', '1921', 'o', 't']
20899

['V', '8137', 'b', 'k', '2081', 'L', '9733', '7525', 'D', '2381', 'O']
29857

['o', 'H']

0