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

SOLUTION: 61496

PROBLEM: ['O', 'K', 's', 'V', '6815', 'c', '9277', 'V', '1783', 'b', 'i', '2045', 'E', 'E', '2035']

SOLUTION: 21955

PROBLEM: ['V', 'A', '1823', '695', 'C', 'K', '3887', '1483', '6221', '5917', '4189', 'o', '9477', '5387', '2427', 'P', 'd', '7763', 'I', 'q']

SOLUTION:
49269