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]: ['b', '5447', 'R', '8489', 'L', '627', 'P', '7491', 'c', 'c', 'r', '6923', '1167']
[EX A]: 30144

[EX Q]: ['o', 'a', 'K', '6031']
[EX A]: 6031

[EX Q]: ['g', 'F', '8843', '7109', 'n', 'p', 'G']
[EX A]:
15952