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: ['887', '8133', 'X', '2253', '8461', 'I', '5425', 'Z', 'z', 'r']

SOLUTION: 25159

PROBLEM: ['D', 'P', 'y', '4891', '1539', 'J', '5737']

SOLUTION: 12167

PROBLEM: ['5455', '363', 'S', 'a', 'n', 'o', '6895', 'O', 'Y', 'B', '567', '5211', '1625', 'y', 'H']

SOLUTION:
20116