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: ['T', '8333', 'C', 'Z', 'n', '1419', 'd', '3205', 'D', '1187', 'd']
Example Output: 14144

Example Input: ['q', '5151', 'R', '441']
Example Output: 5592

Example Input: ['e', 'T', '623', 'A', '537']
Example Output:
1160