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: ['u', 'e', 'P', 'D', '255', '2573', 'E', 'P', 's', '3725', '3391', 'I', '5323', '885']
Example Output: 16152

Example Input: ['9069', '8333', 'H', '2049', '8051', 'L', '2749', '8819', '2883', '9317', 'M', '6515']
Example Output: 57785

Example Input: ['s', '6419', '3925', '7415', '6177', 'B', '5573', 'V', 'W', 'p', '5057', '4201', 'e', 'c', '9527', 'O']
Example Output:
48294