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

SOLUTION: 33985

PROBLEM: ['8389', 'v', 'M', 'S', '5683', '8323', '2653', '8235', '3089', '341', '6545', 'R', '1997', '2287', 'i', 'h', 'I', 'q']

SOLUTION:
47542