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: ['2097', '7815', 'f', '1705', '7553', 'C', 'n', '7091', '1253', 'z', '9229', 'H', 'N', '6481', 'H', 'M', 'G', '4527', '8537']

SOLUTION: 56288

PROBLEM: ['3839', 'D', '4741', 'L']

SOLUTION: 8580

PROBLEM: ['8275', '2979', '6003', 'I', '5861', '3523', '7375', 'T', 'E', '9513', 'p', 'p', '7565', 't']

SOLUTION:
51094