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: ['5199', 'h', 'T', 'T', 'l', '1661', 'p']

SOLUTION: 6860

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

SOLUTION: 28458

PROBLEM: ['3519', '3689', '387', 'P']

SOLUTION:
7595