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: ['7465', 'G', '105', 'A', '3987', 'O', '7385', 'C', '8957']

SOLUTION: 27899

PROBLEM: ['K', '5815', 'E', 'c', '7379', '4995', 'w', 'B', 'j', '6227', 'B', '733', '1491', '3191', '9413', '2751', 'O', 'J', '6239', '3521']

SOLUTION: 51755

PROBLEM: ['6359', 'x', 'p', 'S', 'C', 'G', 'M', 'p', '1981', '8493', 'U', '1905', 'g', '5163', 'P', 'e']

SOLUTION:
23901