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: ['6165', 'x', 'u', 'n', 'V', 'B', '4039', 'l', '991', 'x', '335', '9011', 'K', '8725', 'a', '6291', 'j']

SOLUTION: 35557

PROBLEM: ['6815', 'A', '1055', '4687', '8675', '4615', 'a', '2127', 'w', 'l', 'J', '5025', 'c', 't', '9727', 'G', '8431']

SOLUTION: 51157

PROBLEM: ['5331', '1083', '3081', 'r', '9117', '1157', 'm', '6195', 'a', '3335', '5743', 'f', 'F', 'X', 'B', '6315', '3081', '3449', 'f', 'S']

SOLUTION:
47887