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: ['z', 'j', 'M', 'E', '1689', '8413', '2603', 'b', '5101', 'w', 'r']

SOLUTION: 17806

PROBLEM: ['D', '1693', 'f', 'B', 'o', '3947', '8667', 'f', '6721', '4191', '79']

SOLUTION: 25298

PROBLEM: ['N', 'z', 'y', 'C', '5071', 'Q', 'b', 'E', 'u', 'n', '5771', '4015', 'M', '2525', '1167', 'E', 'S']

SOLUTION:
18549