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: ['D', '7807', '9395', 'T', 'c', '5139', '2827', 't', 'T', 'm', '3717', 'U', '3225', '7419', '2481', 'p', 'C', '5277']

SOLUTION: 47287

PROBLEM: ['7379', 'I', '2031', '8419', 'w', 'b', '9827', 'X', 'Y', 't', '3789', 'B', 'c', '6599', 'F', '6169', 'V']

SOLUTION: 44213

PROBLEM: ['2453', 'x', '3595', '7281', 'n', '1613', 'q', '4747', 'K', 'C', 'D', '5511', '7739', '7955', 'b', '555', 'V', 'G', '4807']

SOLUTION:
46256