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: ['z', '447', '9781', 'R', '6083', 'u', '9229', 'Z', 'F', '2437', '9677', 'n', 'G', '6763', '5883', 'B', '9563', '4575']

SOLUTION: 64438

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

SOLUTION: 14077

PROBLEM: ['f', '1077', 'u', '423', 'J', '2537', 'u', 'b', 'Q', '8355', '807', 'W']

SOLUTION:
13199