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: ['A', '6323', 'T', 'H', 'M', 'S', 'D', 'r', 'v', '8169', '7649', '5149', 'x', '6275']

SOLUTION: 33565

PROBLEM: ['o', 'J', 'B', '7765', '7781', '5513', '8721', 'u', '9557', 'C', 'A', '1281', '6565', 'H', '5559', '1695', '7577']

SOLUTION: 62014

PROBLEM: ['h', 'i', '6837', '9551', 'N', '4319', 'G', 'H', 'Q', '3033', 'q', '2069', 'K', '7289', '1811', '3427']

SOLUTION:
38336