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: ['6577', 'Q', '6865', '7671', 'N']

Output: 21113


Input: Consider Input: ['2087', '8171', 'c', 'd', 'a', '5621', 'n']

Output: 15879


Input: Consider Input: ['6153', 'V', '5041', 'r']


Output: 11194