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: ['6551', 'm', '3941', 'F', 'K', 'u', '7981', '9581', 'X', 'M', 'N', 'e', 'G', 'i']

SOLUTION: 28054

PROBLEM: ['D', 'R', 'Y', '4929', 'P', '7929']

SOLUTION: 12858

PROBLEM: ['v', '9373', '5903', 'V', 'y', 'X', '3187', '9095', 's', 'G', '1801', '7215', '105', 'a', 'Q']

SOLUTION:
36679