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: ['4601', '6021', '3005', 'I', 'f', '4631', 'Q', 'd', '8041', 'D', '8067', '7383', '757', 't', 'd', 'n', '2275', 'p', 'm', '6021']

Output: 50802

Input: Consider Input: ['1007', '4759', 'F', 'j', 'x', 'T', 'y', 'C', '7909', '1347', '7865', '9447', '7237', '1509', '6695', 'a', '9847']
Output: 57622