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: ['3331', '5791', 'r', 'Q', '2243', '8229']

Output: 19594


Input: Consider Input: ['D', 'K', 'n', 'd', 'i', 'U']

Output: 0


Input: Consider Input: ['Y', 'z', '3485']


Output: 3485