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: ['W', 'O', 'c', 'r', 'E', 'w', '9811', '6421', '3543', '4293', '8255', 't', '229', '745', 'w', 'p', '6861', '5305', 'h']
Example Output: 45463

Example Input: ['T', 'u', '8503', 'n', 'U', '8051', '5193', 'A', '9295', '3723', 'g', 'I', '7425', 'y']
Example Output:
42190