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.

['4975', 'M', 'C', 'D', 't', 'i', 't', 'L']
4975

['2469', 'c', '6931', 'a', '2167', '9493', '9403', '4123', '4949', 'R', 'V', 'h', '315', 'T', '9411', 'M', '1329', '8217', '6105', 'Y']
64912

['h', '741', '2779', 'e', '2257', 'E']

5777