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: ['N', 'O', '2635', '8891']

SOLUTION: 11526

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

SOLUTION: 36653

PROBLEM: ['6995', '1239', 'Q', '8407', 'w', 'h', '5279', 'K', 'e', '3237', 'r', '9361']

SOLUTION:
34518