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: ['7335', '813', '6461', '8903', '3709', 'V', 'G', 'I', 'P', 'p', 's', 'v', 'R', '4697', '4263', '9897']

SOLUTION: 46078

PROBLEM: ['B', 'u', '9227', 'b', '8767']

SOLUTION: 17994

PROBLEM: ['W', 'U', '2133', '8801', 'P', 'O', 'e', '527', '8903', 'W', 'g', '7579', 'o', 'j', 'Z', '6607', '8931', 'Y']

SOLUTION:
43481