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

SOLUTION: 24720

PROBLEM: ['7959', '1345', '4605', '6453', 'Q']

SOLUTION: 20362

PROBLEM: ['v', 'e', '2211', '7535', 'O', '3181', 'V', 'f', 'X', '6783', '6491', 'H', 'o']

SOLUTION:
26201