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: ['8147', '3191']
Example Output: 11338

Example Input: ['2775', '7405', 'F', 'D', '9025', '827', 'e', 'j', 's', 'e', 'Q', '1137', 'G']
Example Output: 21169

Example Input: ['k', '2211', 'Z', '8319', 'f', 'o', 'U', '1293', '9697', '2203', 'H', '3033', 'n', 'H', 'M', '3667', 'g', '1053', '5153', '6067']
Example Output:
42696