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: ['W', 'c', 'P', '425', '4133', 's', '1831', '883', '2531', '681', 'U', 'B', 'H', '237', '4245']

SOLUTION: 14966

PROBLEM: ['8743', 'Y', 'O', '8265', '1029', '5689', 'F', 'j', 'Z', 'i', 'S', '1285', '737']

SOLUTION: 25748

PROBLEM: ['D', '7741', '5111', '261', '9141', '2631', '8507', 'd']

SOLUTION:
33392