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.

['9905', 'm', 'Q', 'S', 'T', '7821', '1773', '9515', '3963', '2931', '7023', '8677', '1739', 'O', '909', '9153', '8319', 'k', '2851']
74579

['z', '3199', 'r', '849', 'C', 'v', '1931', 'M', 'Q', '4531', '579', 'x', '8997', '4663']
24749

['M', 'H', '1427', '7715', 'X', '7427', 'F', '5725']

22294