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: ['r', '3537', 'T', '3611', 'k', '4983', 'h', '4317', '8727', 'E', '6471', '8465', 'f', '5429', 'T', '2169', '2171', 'P', '6941', 'D']

Output: 56821


Input: Consider Input: ['3451', '2325', '2511', 'i', '6159', '2291', 'e', 'l', 'P', '1177', 'o', 'T']

Output: 17914


Input: Consider Input: ['a', '7295', '8473', '4121', '2133', '3475', 'r', '6803', '6859', 'N', '1617', 'D', '5311']


Output: 46087