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: ['W', 'H', 'k', 'L', '2425']

Output: 2425


Input: Consider Input: ['2417', '3925', 'e', '6353', '2259', 'I', '8649', 'Q', 'Z', 'R', 'z']


Output: 23603