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: ['W', '8593', '9427', '9931', '8919', 'X', 'B', '8861', '1933', 'Z', 'V', '3427', 'S', '8717', 'd', '1593', '7659', 'Q', 'n']
Example Output: 69060

Example Input: ['z', 'c', 'E', 'Q', '1839', 'g', 'X', 'c', '291', 'c', 'w', 'e', '5957', 'X', '6471', 'A', '8359', 'y', '3611', '5417']
Example Output: 31945

Example Input: ['997', '1021', 'f', '8489', '2309', '7069', 'b', 'y', 'M', '5493', '8507', 'l', '4261', '9573', '1909', '9925', '7295', '5293', '5691']
Example Output:
77832