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: ['p', 'V', '673', '8483', 'S']

SOLUTION: 9156

PROBLEM: ['2013', 'S', 's', '9353', 'b', 'u', '6687', '5429', '3545', '7269']

SOLUTION: 34296

PROBLEM: ['4645', '6939', 'h', 't', '6375', '3263', 'V', 'M', 'C', '8471', 'M', '1521', '1191', 'Y', 'e', '1643', '39', 'r', '9623', '9459']

SOLUTION:
53169