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: ['6551', 'm', '3941', 'F', 'K', 'u', '7981', '9581', 'X', 'M', 'N', 'e', 'G', 'i']

SOLUTION: 28054

PROBLEM: ['6907', '9123', 'L', '8871', 'q', 'C', 'U', '7403', 'F', '3827', '3951', '8879', '2865', 'x', '6175', 'T', '1147']

SOLUTION: 59148

PROBLEM: ['V', 'a', '2517', 'V', '5135', '4723', 'j', 'p', '133', 'B', 'B', '2757', 'F']

SOLUTION:
15265