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.

['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']
27756

['x', '5259', 'T', 'L', 'C', 'H', '2493', 'u', '3851', '2439', 'U']
14042

['4251', '7931', '413', 'h', '8145', 't', 'H', '5149', '8005', 'U', '3081', 'K', 'm']

36975