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: ['O', 'j', 'Z', 'u', '7427', '4225', '3139', '9993', '9945', '3639', 'h', 'j', 'f', '6511', 'e', '4607', '2741', '4743']

SOLUTION: 56970

PROBLEM: ['5467', '3013', '8325', '4005', 'J', 'V', '395', '7477', 'E', 's', '1337', 'g', 'v', '8569', '9757', 'x', '3909', '2983', 's', '7917']

SOLUTION: 63154

PROBLEM: ['e', 'T', '623', 'A', '537']

SOLUTION:
1160