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.

[EX Q]: ['W', 'c', 'P', '425', '4133', 's', '1831', '883', '2531', '681', 'U', 'B', 'H', '237', '4245']
[EX A]: 14966

[EX Q]: ['W', '3561', '4631', '8379', 'W', '6857', '2723', '5393', 'h', 'g', 't', 'I', 'R', '2321', 'l']
[EX A]: 33865

[EX Q]: ['S', '2661', '3153', 'w', 'H', 'u', 'q', '1941', 'I', '1697']
[EX A]:
9452