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: ['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']

SOLUTION: 14215

PROBLEM: ['4811', 'Q', '2289', 'N', 'I', '7681', 'z', '8179', '3359', '5299', 'R', 'z', '8697', '5781', '4803', '2715', '6511', '1371']

SOLUTION: 61496

PROBLEM: ['B', 'j', '7243', '6329', 'F']

SOLUTION:
13572