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]: ['8821', '7221']
[EX A]: 16042

[EX Q]: ['M', '9387', '7125', 'c', '1295', 'X', 'l', '9867']
[EX A]: 27674

[EX Q]: ['P', '237', 'X', '8893', '7931', 'F', '8359', 'S', '6931', '6953', 'r']
[EX A]:
39304