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

SOLUTION: 59148

PROBLEM: ['e', 'K', 'A', 'V', '1169', 'n', '8729', 'V']

SOLUTION: 9898

PROBLEM: ['3959', '8719', 'q']

SOLUTION:
12678