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.

Example Input: ['X', 'f', 'p', 'R', 'N']
Example Output: 0

Example Input: ['3013', '3955', 'f', '1183', '5111', '9509', '2351', '7087', 'f']
Example Output: 32209

Example Input: ['y', '9695']
Example Output:
9695