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: ['7379', 'I', '2031', '8419', 'w', 'b', '9827', 'X', 'Y', 't', '3789', 'B', 'c', '6599', 'F', '6169', 'V']

SOLUTION: 44213

PROBLEM: ['f', 'N', '8597', 't', 'K', '9755', 'j', '9747', '7259', '5493', 'n', '7269', '8493', '2279', '5369', 'f']

SOLUTION: 64261

PROBLEM: ['3345', 'd', '5971', 'b', 'T', 'R', 'S', 'r', '1089']

SOLUTION:
10405