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: ['3895', 's', 'j', '7755', 'H', '7941', '4903', 's', '3629', '1183', '1001', '5569', 'q', '4735']
Example Output: 40611

Example Input: ['6957', '4603', '5299', '8451', '9803', 'b']
Example Output: 35113

Example Input: ['l', '5697', '5505']
Example Output:
11202