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: ['2691', '3861', '7087', '4661', '6527']

SOLUTION: 24827

PROBLEM: ['6321', 'M', 'd', '3673']

SOLUTION: 9994

PROBLEM: ['D', 'G', '9895', '143', '37', 'S', '1539', 'x', 'a', 'x', 'B', 'i', '9719', '839']

SOLUTION:
22172