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: ['129', '8667', 'E', '2919', 'e', 'Y', 'h', 'm', '501', '5911', 'q', '4955', 'D', '1369', 'W']
Example Output: 24451

Example Input: ['I', 'J', 'K', 'D', '5961']
Example Output: 5961

Example Input: ['8557', 'V', '5933', '6647', 'r', '6817', '6535', 'q', 'w', '7251', 'g', 'v', 'y', '5211', 'i', '5765', '893', 'W', '7511', '787']
Example Output:
61907