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.

['f', 'N', '8597', 't', 'K', '9755', 'j', '9747', '7259', '5493', 'n', '7269', '8493', '2279', '5369', 'f']
64261

['4425', 'x', '1959', 'C', 'c', 'D', 'M', '8317', 'q', 'x', '4277', 'N', 'z', 'I', '1921', 'o', 't']
20899

['8369', '1265', 'J', '8733', '2241', '7379', '9217', '6221', 'z', '711', '2683', 'A', '8591', 'b']

55410