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: ['k', 'a']

Output: 0


Input: Consider Input: ['887', '8133', 'X', '2253', '8461', 'I', '5425', 'Z', 'z', 'r']

Output: 25159


Input: Consider Input: ['T', '4693', 'K', 'L', '5975', '9439', '3923', '8385', 'Z', 'S', 'o', '7171']


Output: 39586