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: ['3877', '2685', 'f', 'r', 'q', 'o', 'k', 'i', '2299', '9075', 'X', '4303', '7379', '9205', 'V', '9655', 's']

SOLUTION: 48478

PROBLEM: ['p', 'V', '673', '8483', 'S']

SOLUTION: 9156

PROBLEM: ['D', 'D', '3773', '7043', '7031', '4125', 'e', 'S', 'U', '1103', 'H', '5585']

SOLUTION:
28660