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: ['Q', 'v', 't', '223', 'm', 'l', 'c', 'M', 'b', '2227', 'P', 'e', 'n', 'f', 'S', '2205', '3517', '5545']

SOLUTION: 13717

PROBLEM: ['9401', 'w', 'b', '8287', 'n', 'O', 'H', 'h', '45', '2337']

SOLUTION: 20070

PROBLEM: ['N', '4197', '6509', '8433', '8323']

SOLUTION:
27462