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: ['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']
Example Output: 26791

Example Input: ['h', '2335', '2669', '6035', '9901', '7721', 's', '6181', 'C', 'l', 'x', '8275', '1103', 'S', '6447']
Example Output: 50667

Example Input: ['9337', '8609', 'Y', 'f', 'x', 'F', '981']
Example Output:
18927