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: ['507', 'P', '9697', 'u', '5057']

Output: 15261


Input: Consider Input: ['8109', '5635', 'u', 'M', '1009']

Output: 14753


Input: Consider Input: ['2625', '1611', 'E', '4507', '3013', '1569', 'M', '2607', '1111', 'W']


Output: 17043