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: ['9445', '7291', 'r', 'g', '1175', '7823', '5507', 'j', '7249', '6335', '3853', 'b', 'u', 'S', '365', 'Z', '7489', 'S', 'W', 'e']

SOLUTION: 56532

PROBLEM: ['2923', '3573', '6179', '7673', '6551', 'B', '315', '5169', 'm', '9405', 'm', 'Z']

SOLUTION: 41788

PROBLEM: ['6619', '8817', 'Q', '7853', '7307', 'K', 'e', 'N', 'V', 'Y', '5455', '7691']

SOLUTION:
43742