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', '9173', 's', '8937', 'h', '1881', '7929', 'b', '2441']

SOLUTION: 30361

PROBLEM: ['4949', '2459', 'n', 'f', 'n', 'v', '8421', '1519', '4859', 'c', '9923', '2829', 'K', '4937', 'W', 'R']

SOLUTION: 39896

PROBLEM: ['p', 'g', '9227', 'r', 'o']

SOLUTION:
9227