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]: ['6585', '5263', '9497', '1117', 'a', 'F', 'w', '6595', '547']
[EX A]: 29604

[EX Q]: ['9703', '3313', 'Z', '7651', 'L', 'Z', '4731', 't', '73', '7521', 'o', '6091', 'x', '5593', 'e', 'B', 'b', '8757', '8475', 'R']
[EX A]:
61908