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: ['S', 'D', '3101', '4967', '8197', '5025', '4257', 'S', 'X', '7641', 'n', '6775', '4719', 'o', '2821', 'x', '5605', '2181']

Output: 55289


Input: Consider Input: ['4975', 'M', 'C', 'D', 't', 'i', 't', 'L']

Output: 4975


Input: Consider Input: ['9439', '6879', 'E', 'f', 'F', 'd', '9857', '139', '6643', '2283', '9619']


Output: 44859