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: ['6867', 'x', '8481', '5091', '979', 'a', 'S', 'i', 'd', '1591']

Output: 23009


Input: Consider Input: ['I', '7815']

Output: 7815


Input: Consider Input: ['8367', 'O', '3727', 'z', '1743', '4517', 'p', 'g', '861', 'a', 'Y']


Output: 19215