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.

Input: Consider Input: ['K', '479', 'u', '3489', 'o', '9589', '7153', '7649', '123', 'a', 'A', '3951', '847', 'N', 'R', '947', '9243', 'G', 'a']

Output: 43470


Input: Consider Input: ['4145', 't']

Output: 4145


Input: Consider Input: ['e', '2121', '4587', '7673', '7325', '4781', '7931', 'H', 'f', 'u', 'O']


Output: 34418