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: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']

SOLUTION: 17925

PROBLEM: ['s', '3881', 'l', '5271', '9227', 'Z', '5429', '7691', '6127', '6301', '8533', 'T', '233', 'j', '1685', 'F', 'b', '3797', '6633', '7917']

SOLUTION: 72725

PROBLEM: ['1833', 'K', 'G', '8611', '6341', 'b', '2725', '2613', '7883', 'q', 'j', '5163', '5421', 'J', 'c', 'N', 'l', 'f']

SOLUTION:
40590