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: ['X', 'P', 'x', '9471', '5', 'c', 'f', '5077', '1085', '2267', 'R', 'q', '4987', '9529', 'H', 'n', 'r', 'u']

Output: 32421

Input: Consider Input: ['b', '5447', 'R', '8489', 'L', '627', 'P', '7491', 'c', 'c', 'r', '6923', '1167']

Output: 30144

Input: Consider Input: ['N', 'B', 'K', '8423', '6043', 's', '7283', 'n', '6377', 'n', 'd', '933', 'v', '2289', '5587', 'x', 'K', 's', 'v', 'B']
Output: 36935