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: ['R', '3361', 'c', 'S', 'g', '3829', '7347', '6633', 'e', '9227']

SOLUTION: 30397

PROBLEM: ['6731', 'f', '4561', '5601', 'i']

SOLUTION: 16893

PROBLEM: ['885', 'L', 'V']

SOLUTION:
885