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: ['R', 'J', 'z', 'o', '1121', '7247', '8987', 'u']

Output: 17355


Input: Consider Input: ['4869', 'L']

Output: 4869


Input: Consider Input: ['3645', 'q', 'Z', 's']


Output: 3645