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: ['l', '2511', '2071', 'o', 'F', '7583', '1909', '1859', '3299', '3853', 'h', 'P', 'P', '9175', 'B', 'F']
Example Output: 32260

Example Input: ['901', '1939', '7637', '8863', 'X', '5003', '8791', '4757', 'E', '1525', 'y', '9735']
Example Output: 49151

Example Input: ['7689', '8125', 'G', '73', '8029', 'Q', 'R', '2865', 'v', '755', '3091']
Example Output:
30627