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: ['E', 'y']

SOLUTION: 0

PROBLEM: ['4949', '2459', 'n', 'f', 'n', 'v', '8421', '1519', '4859', 'c', '9923', '2829', 'K', '4937', 'W', 'R']

SOLUTION: 39896

PROBLEM: ['557', '2985', 'a', '4869', '9', '3947', '9229', 't', 'i', '3925', '8719', 'k', 'E']

SOLUTION:
34240