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: ['2485', 'Q', 'G', '5533', 'Y', '21', 'D', 'S']

SOLUTION: 8039

PROBLEM: ['h', '2295', '2913', 'I', '5273', 'L', '2739', '8227', '6537', 'e', '6491', '5463', 'i', '4337', '537']

SOLUTION: 44812

PROBLEM: ['n', 'f']

SOLUTION:
0