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: ['N', 'V', 't', 'X', 't', 'M']

Output: 0


Input: Consider Input: ['q', 'Y', '6021', '4045']

Output: 10066


Input: Consider Input: ['6829', 'p', '6411', 'x']


Output: 13240