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: ['o', 'O', 'H', '7619', '6435', 'X', 'g', '1663']
Example Output: 15717

Example Input: ['3051', 'Z', 'q', 'u', 'x', '2747', 'e', 'B', '4225', 'Q', 'R', '4629', 'F']
Example Output: 14652

Example Input: ['s', '369', 'Z', 'h', 'K', '2183', 'y', 'P', 'W', 'f', '6675', 'A', 'Z', '9159', '4179', '8695', '3015', 'o', '7321']
Example Output:
41596