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: ['K', 'O', 'p', '1669', '8647', '3417', 'a', '8903', 'V', 'E', 'l', 'a', '5177', 'J', '6559', '5377', 'X', '9427']
Example Output: 49176

Example Input: ['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']
Example Output: 45451

Example Input: ['8659', 'l', 'w', '4241', 'V', '6523', 'I', '9433', 'D', 'B', 'm', '9779', '9621', '1343', '8143', '2831', 'W']
Example Output:
60573