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: ['8755', 'A', '2893', '6703']

Output: 18351


Input: Consider Input: ['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']

Output: 27756


Input: Consider Input: ['3053', 'X', '9303', '4877', 'F']


Output: 17233