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

Output: 6713


Input: Consider Input: ['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']

Output: 26755


Input: Consider Input: ['1141', '6445', '9791', 'L']


Output: 17377