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: ['3557', '3345', '307', '9791', '1897', 'O']

Output: 18897


Input: Consider Input: ['h', '2335', '2669', '6035', '9901', '7721', 's', '6181', 'C', 'l', 'x', '8275', '1103', 'S', '6447']

Output: 50667


Input: Consider Input: ['X', '9503', 'p', 'X', '4529', '6831', '7585', 'p', 'z']


Output: 28448