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: ['1845', '273', '6921', 'u', '165', 'n', 'y', 'I', 'u', 'X', '5503', 'L', 'G', 'V', '6223', '1123', 'v']

SOLUTION: 22053

PROBLEM: ['t', '7015', '2239', 'I', 'F', 'E', '1363', '9615', '6179', '2539', 'z', '8745', '1319', '4715', '9071', 'K', '3707', '6149', 'd']

SOLUTION: 62656

PROBLEM: ['Q', '6269', 'V', 'n', '7759', 'q', '2183', 'V', 'W', '6811', 'R', 'W', '4809', '9353', 'f', 'c', '4979', 'r', '3729', 'Q']

SOLUTION:
45892