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: ['5715', 'r', 'R']

Output: 5715


Input: Consider Input: ['o', 'L', 'E', 'V', 'D', 's', 'Z', 'm', 'a', '2785', 'I', 'v', 'B', '7909', '1599', 'V', 'N']

Output: 12293


Input: Consider Input: ['n', 'X', 'Q', '2735', '515', '6647', '9335', 'F', 'a', 'C', '1879', '3865', '4317', '709', '5849', 'u', 'G', 'V']


Output: 35851