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: ['h', '6937', 'U', 'f', 'S', 'm', '9699', 'E', '4559', 'p', 'Z', 'o', '6409', 's', '4537', '5135', '6901', '6489', '5833', 'l']

Output: 56499


Input: Consider Input: ['X', 'P', 'x', '9471', '5', 'c', 'f', '5077', '1085', '2267', 'R', 'q', '4987', '9529', 'H', 'n', 'r', 'u']

Output: 32421


Input: Consider Input: ['8325', '8289', '4227', 'u', 'Y', 'x', '2281', 's', 'k', 'R', '2877', '7115', '7065', '7927', 'A', '9287', 'M', '2375', '6667', 'f']


Output: 66435