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: ['g', '5301']

SOLUTION: 5301

PROBLEM: ['773', 'e', '4451', 'S', 'I', 'r', 'e', 'V', 'Q', 'g', 'J', 'L', '7655', 'O']

SOLUTION: 12879

PROBLEM: ['S', '9797', 'y', '3665', '1259', 'O', '933']

SOLUTION:
15654