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

Example Input: ['8609', '8045', '2517', '3821', 'x', '3895', 't']
Example Output: 26887

Example Input: ['W', 'y', '8567', 'j', '9647', 'f', '4675', 'P', '6871', 'h']
Example Output:
29760