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: ['7771', 'g']

Output: 7771

Input: Consider Input: ['4949', '2459', 'n', 'f', 'n', 'v', '8421', '1519', '4859', 'c', '9923', '2829', 'K', '4937', 'W', 'R']

Output: 39896

Input: Consider Input: ['q', 'k', '1375', 'i', 'k', '3751', '9879', '353', '3753', '6161', '8651', 'X', '5949', 'x', '4683', '9117', 'O', 'Q', '9817']
Output: 63489