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', 'W', '565', '6625', '903', 'o', '7995', '8339', '5251', 'e', 'a', '1081', '5813', 'o']

SOLUTION: 36572

PROBLEM: ['B', 'K', '9399', 't', '5541', 'w', '1939', '7841', 'q']

SOLUTION: 24720

PROBLEM: ['S', 'S', 'L', 'p', '9489', 'r', '3011', 'R', 'v', '6019']

SOLUTION:
18519