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: ['q', '867', 'e', 'z']

Output: 867


Input: Consider Input: ['o', 'a', 'K', '6031']

Output: 6031


Input: Consider Input: ['7497', '9421', '1535', 's', 'P', 'w', '8751']


Output: 27204