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: ['901', '1939', '7637', '8863', 'X', '5003', '8791', '4757', 'E', '1525', 'y', '9735']

SOLUTION: 49151

PROBLEM: ['6551', 'm', '3941', 'F', 'K', 'u', '7981', '9581', 'X', 'M', 'N', 'e', 'G', 'i']

SOLUTION: 28054

PROBLEM: ['C', 'm', '8541', 'i', '5965', 'Q', 'r', '4785', 'P', '6027', '8419']

SOLUTION:
33737