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: ['v', 'Y', '4135', '8645', '263', '5377', '8677', 'Z', 'W', 'g', 'n', 'r', 's', '8513', '5677', 'u', '3033', 'I']

SOLUTION: 44320

PROBLEM: ['C', '9973', 'b', '693', 'y', 'H', 'C', 'P', 'b', 'J', 'f', 'T', '2317', 'O', '5755', '8201', 'p', 'y', '8721', 'i']

SOLUTION: 35660

PROBLEM: ['9585', 'g', '1235', 'K', '4281', '8771', '7521', 'U', '7921', 'J', '5475', 'l', '6839', '9199', '3719', 'M']

SOLUTION:
64546