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: ['7771', 'g']

SOLUTION: 7771

PROBLEM: ['G', 'Z', '4819', '9763', '9987']

SOLUTION: 24569

PROBLEM: ['i', '4371', '2625', '2781', 'T', 'l', 'H', '9101', '3307', 'r']

SOLUTION:
22185