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: ['F', 'z', '1159', '345']

Output: 1504

Input: Consider Input: ['3351', '6445', 'Y', '8455', 'V', 'z', 'a', 'V', 'S', '8551', '4101', 'q', '8743', '5999', '7155', '3825', '2241', '9957']

Output: 68823

Input: Consider Input: ['7503', '4903', '6255', 'f', '6847', 'Z', '1403', 'X', '2745', '8743', '6913', '4897', 'M', '5037', '1579', 'I', 'o']
Output: 56825