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: ['9905', 'm', 'Q', 'S', 'T', '7821', '1773', '9515', '3963', '2931', '7023', '8677', '1739', 'O', '909', '9153', '8319', 'k', '2851']

Output: 74579


Input: Consider Input: ['507', 'P', '9697', 'u', '5057']

Output: 15261


Input: Consider Input: ['1265', 'H', 'L', '5295', 'l', 'o', '6375', 'S', 'L', 'h', 'M', 'G', 'w', 'T', 'k', '4071', '9525', '9803']


Output: 36334