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: ['d', '6851', 'o', '5521', 'l', '3911', 'w', '1005', 'e', '3323', 'r', '7311', '4377']

SOLUTION: 32299

PROBLEM: ['7361', '6913', '3605', '2081', '7619']

SOLUTION: 27579

PROBLEM: ['a', 'S', '8291', 'd', '247', 'z', 'j', '61', '3225', 'T', 'J', 'B', '6063', 's', '9779']

SOLUTION:
27666