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: ['h', '2295', '2913', 'I', '5273', 'L', '2739', '8227', '6537', 'e', '6491', '5463', 'i', '4337', '537']
Example Output: 44812

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

Example Input: ['b', '8353', 'B', 'G', '4577', 's', '8069', '2679', '9879', '6033', 'J', 'I']
Example Output:
39590