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', 'k', '3355', 'Y', '6635', 'M', '4839', 'T', 'd', '495', 'g', 'E', 'g', 'F', 'S', '5377', 'g']

Output: 20701


Input: Consider Input: ['29', 'N', '5061', '7191', 'z', '8367']

Output: 20648


Input: Consider Input: ['6677', '7439', '609', '71', '5357', '271']


Output: 20424