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: ['h', '9539', '3373']

Output: 12912


Input: Consider Input: ['h', '3263', 'a', '5737', '7145', '4579', '6853', 's', '8501', 'r']


Output: 36078