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: ['6731', 'f', '4561', '5601', 'i']

Output: 16893

Input: Consider Input: ['K', '4403', 'a', '3881', '4139', 'w', '1861', 'G']

Output: 14284

Input: Consider Input: ['v', '3735', 'n', 'z', 'P', '813', 'm', 'u', '129', '5663', '1375', '1371', 'e', 'G', 'n']
Output: 13086