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

Output: 12912


Input: Consider Input: ['F', 'z', '1159', '345']

Output: 1504


Input: Consider Input: ['6289', 'B', 'g']


Output: 6289