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: ['3145', 'C', '7725', 'k', 'z']

Output: 10870


Input: Consider Input: ['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']

Output: 30645


Input: Consider Input: ['1719', '4501', 'B', 'E', '5563', '5671', '6951', 'a']


Output: 24405