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: ['a', 'f', '2185', 'N', '6381', '6429', '7499', 'd', '757', 'k', 'k', 'b', 'N', '2697', 'A', '8037']

SOLUTION: 33985

PROBLEM: ['U', '5607', 'Q', 'j', 'I', '3745', '3031']

SOLUTION: 12383

PROBLEM: ['n', '3003', 'F', 'p', '2587', 'Z', '9967', '7623', '2035', 'm', 'u', 'Y']

SOLUTION:
25215