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.

['3051', '5343', 'k', 'k', '6815', 'E', '4745', 'A', 'A', '1251', '6649', 'f', '4133', 'X']
31987

['f', 'F', 'E', '2279', 'r', '6419', 'd', 'M', '3975', '3797', '9201', 'F', 'c', '4753', '959', 'v', '8963', '4007']
44353

['C', 'i', 'H', 'D']

0