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: ['83', 'k', 'p', 'o', 'b', '7819', '2089', '4141', 'c', 's', '6045', '6783', 'J', 'B', 'x', 'O', 'X', '9693']

SOLUTION: 36653

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

SOLUTION: 25748

PROBLEM: ['9179', 'W', 'n', '4689', 's', '3859', '5061', '6679', '5847', 'X', 'Y']

SOLUTION:
35314