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]: ['q', 't', '4837', 'F', '2367', '1867', '8361', 'm']
[EX A]: 17432

[EX Q]: ['4811', 'Q', '2289', 'N', 'I', '7681', 'z', '8179', '3359', '5299', 'R', 'z', '8697', '5781', '4803', '2715', '6511', '1371']
[EX A]: 61496

[EX Q]: ['R', '809', '211', '1527', '4535', '223']
[EX A]:
7305