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: ['773', 'e', '4451', 'S', 'I', 'r', 'e', 'V', 'Q', 'g', 'J', 'L', '7655', 'O']

SOLUTION: 12879

PROBLEM: ['b', '5447', 'R', '8489', 'L', '627', 'P', '7491', 'c', 'c', 'r', '6923', '1167']

SOLUTION: 30144

PROBLEM: ['R', 'B', '3679', '7905', 'E', 'm', '163', '6773', 'v', 'X', 'O', '923']

SOLUTION:
19443