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: ['8667', '4129', '7075', '6345', '1315', 'M', 'F', '9073']

SOLUTION: 36604

PROBLEM: ['Y', 'X']

SOLUTION: 0

PROBLEM: ['5457', '5939', '1707', '705', 'E', 'R', '347', 's', '4023', 'm', 'c', 'f', 'p']

SOLUTION:
18178