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: ['C', 'v', '1353', 'e', 'x', 'A', 'D', '1243', '477', 'z', '3483', '5213', 'k', 'm', 'n']

SOLUTION: 11769

PROBLEM: ['B', 's']

SOLUTION: 0

PROBLEM: ['3691', 'X', 'Y', '2955', '7809', '7455', 'S', 'f', '9019', '6245', '927', 'E']

SOLUTION:
38101