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.

Input: Consider Input: ['4515', '3911', 'M', 'T', 'w', 'F']

Output: 8426


Input: Consider Input: ['5095', '8235', '4901', 's', '4177', '3077', 'l']

Output: 25485


Input: Consider Input: ['4617', 'k', '1487', 'A']


Output: 6104