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: ['4515', '3911', 'M', 'T', 'w', 'F']

SOLUTION: 8426

PROBLEM: ['2417', '6671']

SOLUTION: 9088

PROBLEM: ['2729', 'W', 'i', '9073', '343', 'j', '2329', '9159', '4825']

SOLUTION:
28458