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: ['3557', '3345', '307', '9791', '1897', 'O']

Output: 18897


Input: Consider Input: ['57', '9977', '2657', 'p', '9573', '7745', '4755', 'U']

Output: 34764


Input: Consider Input: ['Z', 'S', 'H', 'e', 'o', 'i', '6953', '5121', '6391', '8931', 'b', '7111', '4847', '6715', 'L', '4181', 'l', 'q', 'v', 'j']


Output: 50250