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]: ['z', 'E', 'u', '4437', '7767']
[EX A]: 12204

[EX Q]: ['c', 'E', 'M', '1303', 'y', 'H']
[EX A]: 1303

[EX Q]: ['Y', '8973', 'H', 'a', '9205', 'D']
[EX A]:
18178