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.

Input: Consider Input: ['3557', '3345', '307', '9791', '1897', 'O']

Output: 18897

Input: Consider Input: ['e', 'T', 'O', 'q', '5511', 'G', 'm', 'E', '2153', 'O', '1139', '5097', 'n', '5653', 'v']

Output: 19553

Input: Consider Input: ['3943', 'b', '6873', '1491', '8325', '8457']
Output: 29089