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: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']

SOLUTION: 5636

PROBLEM: ['6515', '5525', 'o', 'Q', '9049', 'f', 'p', 'X', '2057', 'h', '7585', '3617', '7817']

SOLUTION: 42165

PROBLEM: ['9055', '2233', 'P', 'g', 'J', 'f', 'Q', '7881', 'K', 'V', 'r', 'E']

SOLUTION:
19169