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: ['j', 'A', 'L', 'i', 'I', '3827', '8245', 'H', 'J', '8117', 'w', '4659', 'Y', 'x', 'K']

SOLUTION: 24848

PROBLEM: ['3723', 'v', 'j', 'e', '2017', 'd', '4211', '2079']

SOLUTION: 12030

PROBLEM: ['1717', 'M', '5291', 'X', 'L', 'o', 'r', '8941', '7589', 'n', 'v', 'o', 'u', 'u', 'M', '7031']

SOLUTION:
30569