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: ['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']
Example Output: 45451

Example Input: ['U', '9593', '2079', '5959', 'T', '5849', 'w', 'b', '9743', '6689', 'k', 'J']
Example Output: 39912

Example Input: ['G', 'R', '6609', 'W', 'L', '5147', 'X', 'u', '6033', 'O', '5749', 'u', '9735', 'C', '213', 'e']
Example Output:
33486