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]: ['k', 'a']
[EX A]: 0

[EX Q]: ['Q', '1767', '5523', 'I', '933', 'h', '2189', 'f', '7795', 'X', 'M', 'G', '1215', 'W', '8619']
[EX A]: 28041

[EX Q]: ['3711', 'T']
[EX A]:
3711