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]: ['R', '9751', '4367', 'l', 'N', '5125', '8751', '7507', 'y', 'K', '6127']
[EX A]: 41628

[EX Q]: ['Y', 'X']
[EX A]: 0

[EX Q]: ['Q', '2143', '4575', 'f']
[EX A]:
6718