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: ['l', 'V']

SOLUTION: 0

PROBLEM: ['4145', 't']

SOLUTION: 4145

PROBLEM: ['t', 'a', 'K', 'R', '4725', '4299', '8921', 'y']

SOLUTION:
17945

