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: ['4533', 'D', '823', 'a', 'x', 'p', '9787', '2587', 'T', 'Z', '2207', '8719', 'F', '7675', 'T', '2777', '203', 'N', 'o']

SOLUTION: 39311

PROBLEM: ['3319', 'e', 'c', 'G', '2399', '1557', '4813', 'z', 'U', '4895', 's', '1193', 'A', 'G']

SOLUTION: 18176

PROBLEM: ['7803', '9857', '777', '8159', '1881', '7913', 'p', 'T', '4077', 'U', 'H', 'R']

SOLUTION:
40467