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', '1939', '7637', '8863', 'X', '5003', '8791', '4757', 'E', '1525', 'y', '9735']
Example Output: 49151

Example Input: ['1001', 'T', 'w', 'f', 'Q', '4035', 'b', 'q', 'x', 'R']
Example Output: 5036

Example Input: ['9951', 'q', '1889', 'g', 'X', '8965']
Example Output:
20805