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: ['1815', 'U', '869', 's', '1847', 'C', '2711', 'S', 'i', '7949', '4477', '5093', 'D', '8661', '3835', '4087', '73', 'V', '3149', 's']

SOLUTION: 44566

PROBLEM: ['E', 'y']

SOLUTION: 0

PROBLEM: ['m', '3151', '9895', 'O', 'x']

SOLUTION:
13046