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]: ['W', 'c', 'P', '425', '4133', 's', '1831', '883', '2531', '681', 'U', 'B', 'H', '237', '4245']
[EX A]: 14966

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

[EX Q]: ['B', 'O', '1277', '4563', '1373', '4021', '1837', '5203', '8175', 'S', 'G', '9221', 'J', 't', '4103', '3713', 'c']
[EX A]:
43486