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]: ['4145', 't']
[EX A]: 4145

[EX Q]: ['Z', '4157', '5185', 'U', 'i', '1115', 'A', '7427', '3313', 'S']
[EX A]: 21197

[EX Q]: ['n', '1117', 'x']
[EX A]:
1117