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: ['8739', 'K']

Output: 8739


Input: Consider Input: ['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']

Output: 45451


Input: Consider Input: ['4443', '9583', '4925', 't', 'b', 'Z', '6725', 'X', '8491', 'D', '2871', 'G', '4095']


Output: 41133