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', 'V']
Example Output: 0

Example Input: ['s', 't', 'W', '163', 'v']
Example Output: 163

Example Input: ['f', 'V', '5645', '8285', 'a', 'L', 'y', '1927', '2319', '2871', 'j']
Example Output:
21047