TASK DEFINITION: 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.
PROBLEM: ['e', 'K', 'A', 'V', '1169', 'n', '8729', 'V']

SOLUTION: 9898

PROBLEM: ['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']

SOLUTION: 21509

PROBLEM: ['5327', 'M']

SOLUTION:
5327