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: ['p', '4689']
Example Output: 4689

Example Input: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']
Example Output: 17925

Example Input: ['d', 'F', 'k', '1393', 'H', 'p', '4399', '4723', '7751', 'W', 'v', '7081']
Example Output:
25347