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: ['6001', '6423', '5591', '8721', 't', 'x', '3723', 'E', 'F', '7353', 'b']

Output: 37812

Input: Consider Input: ['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']

Output: 44216

Input: Consider Input: ['8909', '6291']
Output: 15200