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: ['Z', '6245', 'N', '1403', 'b']

SOLUTION: 7648

PROBLEM: ['6327', '4929', 'j', '3351', '7897']

SOLUTION:
22504