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: ['6787', 'W', 'I', '4929', 'j', 'I', '3487', 'F', '3927', 'Q', 's', 'X', '9939', 'n']

Output: 29069


Input: Consider Input: ['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']

Output: 6713


Input: Consider Input: ['7871', '1625']


Output: 9496