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: ['9403', '2607', 'G', '7901', 'K', '7967', 'a', 'n', '1967', 'x', 'g', '1081']

Output: 30926


Input: Consider Input: ['M', 'F', '4477', '1565', '4407', 'r', 'v', '7237', '83', '5243', 'O', 'z', 'W', '7703', 'Q', 'i', '9657', 'n']

Output: 40372


Input: Consider Input: ['O', '2205', '751', '9269', 'Q', 'M', 'k', '6659', '3709', '8961', 'i', 'Y', 'r']


Output: 31554