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', 'i', '7807', 'g', '1611', '6733', 'V', '561', 'C', '8575', 's', 'E', '8129', 'F']

SOLUTION: 33416

PROBLEM: ['x', '5259', 'T', 'L', 'C', 'H', '2493', 'u', '3851', '2439', 'U']

SOLUTION: 14042

PROBLEM: ['D', 'B', 'e', '4047', '5325', 'Y', '1677', '3363', 'E', '6867', 'P', 'Y', 'g', '363', '7259', 'R', '2839', 'A']

SOLUTION:
31740