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: ['1123', '2765', '9395', '9695', '7963', '3813', '9987', 'y', 'N', 'F', '2757', 'o', 'r', '4827', '3523', 'G', 'j', '9785', 'C']

SOLUTION: 65633

PROBLEM: ['P', '6161', 'k', '5925', 'h', 'G', 'n']

SOLUTION: 12086

PROBLEM: ['3691', 'g', '9331', 'O', 'K', '3283']

SOLUTION:
16305