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: ['D', '9679', 'e', '5537', 'G', 'l', '2653', 'a', 'Y', '8467', 'q', 'L', '7239', 'O']

SOLUTION: 33575

PROBLEM: ['m', '3481']

SOLUTION: 3481

PROBLEM: ['k', '213', 'j', '3707', 'p', '1339', '6667', '3961', 't', '7735']

SOLUTION:
23622