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: ['x', '1887', 'E', '3995', '5677', '2749', '9951']
Example Output: 24259

Example Input: ['4463', '489']
Example Output: 4952

Example Input: ['47', '9565', 'v', 'e', 'C', '6029', '7851', '2393', 'Z', '5221', 'H', '4141', 'k']
Example Output:
35247