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: ['Y', 'X']

Output: 0


Input: Consider Input: ['3873', 'D', 'J', '2799', 'k', 'F', 'I', '3457', '5647', '4815', '7509', 'Y', '1251', '2211']

Output: 31562


Input: Consider Input: ['l', '7789', 'D', 't', 'c', 'c', '4227', '8199', '3427', 'B']


Output: 23642