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: ['8207', '4791', '3925', 'b', 'Z', '8471', '9215', '3117', 'p', '9095', 'h', 'k', 'E', 'h', '6047']

SOLUTION: 52868

PROBLEM: ['D', 'K', 'n', 'd', 'i', 'U']

SOLUTION: 0

PROBLEM: ['1813', 'B']

SOLUTION:
1813