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: ['U', '9593', '2079', '5959', 'T', '5849', 'w', 'b', '9743', '6689', 'k', 'J']

SOLUTION: 39912

PROBLEM: ['2585', '3043', 'w', '7697', '53', 't', 'A']

SOLUTION: 13378

PROBLEM: ['8959', 'y', 'T', '3423', 'c', '8141', 'a', 'U', 'T', '6307', 'a', '533', '7969', '4239']

SOLUTION:
39571