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: ['B', 'u', '9227', 'b', '8767']

Output: 17994


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: ['C', 'p', '757', 's']


Output: 757