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', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']
Example Output: 30645

Example Input: ['b', 'O', '7023', 'q', '2667', '681', 'C', '5707', '7125', 'q', 'Q', '1375', '8869', '6709']
Example Output: 40156

Example Input: ['G', 'T', 'E', 'c', 'j', 'p', 'x', 'U', '7837', 'C', 'r', '4557', 'F', '6627', '1561']
Example Output:
20582