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: ['w', '8035', 'J', '2671', '7509', '1573', '6915', '8569', '345', 'T', 'P', 's', '1341', '7823', '8671', 'm', 'Q', 's', 'N']

Output: 53452


Input: Consider Input: ['2729', 'p', '2429']


Output: 5158