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: ['3883', 'T', '6175', 'B', '4365', '3719', 'V', 'B', '3173', 'K', 'Z']

SOLUTION: 21315

PROBLEM: ['e', 'T', 'O', 'q', '5511', 'G', 'm', 'E', '2153', 'O', '1139', '5097', 'n', '5653', 'v']

SOLUTION: 19553

PROBLEM: ['1965', '1461', '5501', '7145', '7409', '6181', '6799', 'r', 'C', 's', 'j', '2355']

SOLUTION:
38816