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: ['r', 'b', 'G', 'H', '255', '6809', '5133', '1059', '4317', 'P', '7219', 'd', '805', 'G', '5243', '8305', '8509', 'o']
Example Output: 47654

Example Input: ['597', 'i', 'd', '3201', 'u', '1111', '8563', 'c', 'E', '5983', '6293']
Example Output: 25748

Example Input: ['4407', '5215', 'N', '4343', '1483', '7945', 't', '6197', '4381', '7467', 'l', '3743', 'A', '3405', '2057', '9899', '2429', '4533', 'g', 's']
Example Output:
67504