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: ['B', 'u', '9227', 'b', '8767']

Output: 17994


Input: Consider Input: ['5573', '6221', 'C', '8649', '6603', 'q', '9403']

Output: 36449


Input: Consider Input: ['6147', '2793']


Output: 8940