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

Output: 15879


Input: Consider Input: ['457', '173', '6807', 'o', '555', 'l', 's', 'Z', 'm', '3035', '1283', '5645', 'S', '8641', 'J', 'Z', 'z', 'K']

Output: 26596


Input: Consider Input: ['7563', 'K', 'r', '5027', 'o', 'i', '7523', 'p', '589', 't', '7055', 'E', '513', '9003', 'r']


Output: 37273