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: ['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']

SOLUTION: 6713

PROBLEM: ['2469', 'c', '6931', 'a', '2167', '9493', '9403', '4123', '4949', 'R', 'V', 'h', '315', 'T', '9411', 'M', '1329', '8217', '6105', 'Y']

SOLUTION: 64912

PROBLEM: ['9059', 'l', '4077', 'x', '1373', 'O', 'T', 'Q', 'C', 'u', '9121', 'l']

SOLUTION:
23630