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: ['6921', 'a', 'U', '2821', '2111', 'h', '3937', '3697', 'd', '6309', 'q', '7961', '5287', '5375', '2721', '4523', 'V', '8633', 'c', '7643']

Output: 67939


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

Output: 17043


Input: Consider Input: ['y', '7859', '1205', 'H', '5459', '8349', 'W', 'R', '2725']


Output: 25597