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: ['2787', 'z', '9351', '3339']

SOLUTION: 15477

PROBLEM: ['V', '6121', '5813', '9779', 'o', 'g', '2519', 'M', 'B', 'W']

SOLUTION:
24232