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: ['h', '9539', '3373']

SOLUTION: 12912

PROBLEM: ['W', '3561', '4631', '8379', 'W', '6857', '2723', '5393', 'h', 'g', 't', 'I', 'R', '2321', 'l']

SOLUTION: 33865

PROBLEM: ['3365', '4165', 'V', '1151', '6757', 'y', '5067', 'N', 'b', 'd', 'U', 'W', '7845']

SOLUTION:
28350