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: ['3883', 'T', '6175', 'B', '4365', '3719', 'V', 'B', '3173', 'K', 'Z']

Output: 21315


Input: Consider Input: ['6833', 'R', '7323', 'd', '3487', '8777', '9053', 'y', 'i', 'O', '467', 'b', '5969', 'D', 'B', 'r', '3073', 'i', 't', 'd']

Output: 44982


Input: Consider Input: ['669', '9863', 'H', 'X', '7359', 'L', '2121', 'g', 'T', 'Z', 'g', 'r']


Output: 20012