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: ['7379', 'I', '2031', '8419', 'w', 'b', '9827', 'X', 'Y', 't', '3789', 'B', 'c', '6599', 'F', '6169', 'V']

SOLUTION: 44213

PROBLEM: ['129', '8667', 'E', '2919', 'e', 'Y', 'h', 'm', '501', '5911', 'q', '4955', 'D', '1369', 'W']

SOLUTION: 24451

PROBLEM: ['k', 'C', '6567', 's']

SOLUTION:
6567