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: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']
Example Output: 15614

Example Input: ['7215', 'd', 'q', 'k', '9301', 'P', 'x', 'C', 'g', 'e', 'o', '2769', '6993', '9769', 'v', '9007', '4131', '8627', 'q']
Example Output: 57812

Example Input: ['1175', 'L', '3129', '357', '2209', 'o', 'x', 'Y', '6875', '9189', '2607', 't', '849', '5165', 'K']
Example Output:
31555