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: ['D', '1693', 'f', 'B', 'o', '3947', '8667', 'f', '6721', '4191', '79']

Output: 25298


Input: Consider Input: ['1057', '3937']

Output: 4994


Input: Consider Input: ['401', 'H', '8899', '6721', '9175', 'H', '3707', 'L']


Output: 28903