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: ['D', 'R', 'Y', '4929', 'P', '7929']

Output: 12858


Input: Consider Input: ['u', 'W', '1561', '9243', '4923', '9385']

Output: 25112


Input: Consider Input: ['H', 'J', '749', 'Y', '6461', 'X', '5071', 'q', 'E', 's', '7153']


Output: 19434