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: ['J', '177', '8449', '2067', 'a', 'G', 'p', 'd', '5161', 'M', '2403', '5541', 'q', '4375', 'O']

SOLUTION: 28173

PROBLEM: ['q', '6631', 'b', '4207', '7523', '9853', '9203', 'P', '5029', 'b', '2319', '4717', '2485']

SOLUTION: 51967

PROBLEM: ['9675', 'U', 'R', '6567', '4703', '9831', '4189', 'U', 'z', '6763', 'v', 'N', '5917', '7185', 'k', '1713', '3951', 'T', 'S', '1877']

SOLUTION:
62371