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: ['9989', 'B', 'E', '5181']

SOLUTION: 15170

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

SOLUTION: 0

PROBLEM: ['8173', '9295', 'q', '4911', '9927', 'd']

SOLUTION:
32306