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]: ['7755', '8383', 'y', 'k', '4869', '2809']
[EX A]: 23816

[EX Q]: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
[EX A]: 5636

[EX Q]: ['s', 'P', '1587', 'g', 'J', '7897']
[EX A]:
9484