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: ['3451', '2325', '2511', 'i', '6159', '2291', 'e', 'l', 'P', '1177', 'o', 'T']
Example Output: 17914

Example Input: ['2175', '4539', 'L', 'T', 'q', '2407', 'F', 'V', 'b', '9475', '2279', '4469', '6231']
Example Output: 31575

Example Input: ['E', '1957', '2811', '8061', '3001', 'X', '9159', '2071', '6129', 'K', 'W', 'h', 'T', '4123', 'l', '6981', 'q']
Example Output:
44293