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]: ['6367', '9923', '9141']
[EX A]: 25431

[EX Q]: ['4271', 'N', 'M', '5239', '7037', 'x', 'U', 's', '7107', '4163', 'f', '3607', '6155']
[EX A]: 37579

[EX Q]: ['6731', '2871', 'd', 'I', 'o', 'i', 'I', '7975']
[EX A]:
17577