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: ['z', 'E', 'u', '4437', '7767']

Output: 12204


Input: Consider Input: ['n', 'm', 'Y', 'v']

Output: 0


Input: Consider Input: ['r', 't', 's', '2781', '8639', '2853', '1133', 'Z', 'y', 'n', '3935', 'o', '7375', 'a', 'Z', '9579', '5015', '1663']


Output: 42973