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.

Example Input: ['I', '7815']
Example Output: 7815

Example Input: ['6815', 'A', '1055', '4687', '8675', '4615', 'a', '2127', 'w', 'l', 'J', '5025', 'c', 't', '9727', 'G', '8431']
Example Output: 51157

Example Input: ['J', '3385', 'U', '7703', 'o', 'I', 'd', 'G', 'u', '8559', 'U', 'f']
Example Output:
19647