TASK DEFINITION: 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.
PROBLEM: ['v', '9511', 'f', 'q']

SOLUTION: 9511

PROBLEM: ['6469', '3027', 'Z', '3353', 'a', 'S', '3879', '8471', 'H', 'I', 'y', '2661', '9007', 'D']

SOLUTION: 36867

PROBLEM: ['6927', 'E', '4233']

SOLUTION:
11160