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: ['6645', 'k', '4879', 'N', '113', 'L', 'x', '8365', 'v', 'A']

SOLUTION: 20002

PROBLEM: ['a', 'm', '3205', '1869', '1117', 'K', '5785']

SOLUTION: 11976

PROBLEM: ['V', '3717', 'e', 'F', 'z', '2671', '9559', '3343', '1427', '7191', '2297', '9853', 'S', '67', 'K', '207']

SOLUTION:
40332