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]: ['B', 'u', '9227', 'b', '8767']
[EX A]: 17994

[EX Q]: ['7669', '3367', 'A', 'Z', '6173', '4391', 'f', 'S', '9657', '2631']
[EX A]: 33888

[EX Q]: ['n', 'W', '565', '6625', '903', 'o', '7995', '8339', '5251', 'e', 'a', '1081', '5813', 'o']
[EX A]:
36572