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: ['5499', '39', 'Q', 'b', 'W', '7155', '2515']

SOLUTION: 15208

PROBLEM: ['Y', '263', '641', '1163', 'p', 'r', 'L', '4425', 'C', '7585']

SOLUTION: 14077

PROBLEM: ['O', '4661', 'F', 'l', '747', '5019', '5101', 'M', '5009', '4875', '6873', '9893', 'W', 'l', 'l', '881', '7503', '4351', 'G', 'S']

SOLUTION:
54913