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', '7305', '8903', 'b', '7687', '6393', '6939']

SOLUTION: 37227

PROBLEM: ['O', '6337', 'j', '6009', 'z']

SOLUTION: 12346

PROBLEM: ['V', 'u', '1617', '973', 'v', '109', 'p', 'R', '6871', '2823', '7019', '9757', '925', 'g']

SOLUTION:
30094