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: ['R', 'C', 'S', 'x', '1529', 'r']

Output: 1529


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

Output: 5715


Input: Consider Input: ['S', '1249', '6233', 'I', '6733', 'r', 'A', 'E', 'h', 'x', 'p', 'c', '515', '1029', '1593', '1035']


Output: 18387