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: ['5215', 'c', '839', 'V']

Output: 6054


Input: Consider Input: ['A', 'y', 'u', 'S']

Output: 0


Input: Consider Input: ['2849', '2989', 'e', 'u', 'Q', 'A', 'X', '6685', '5807', 'S', 'p', 'I', '3143', 'S', 'v', 'U']


Output: 21473