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: ['c', '4501', 'O']

Output: 4501


Input: Consider Input: ['q', '867', 'e', 'z']

Output: 867


Input: Consider Input: ['3685', 'S', 'U', '8413', 'b', '7707', 'U', '9165', '9101', 'j', 'W', 'K', 'm', 'r', 'o', '8323', 'A', '353', '3799', '3183']


Output: 53729