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: ['7465', 'G', '105', 'A', '3987', 'O', '7385', 'C', '8957']

SOLUTION: 27899

PROBLEM: ['3723', 'v', 'j', 'e', '2017', 'd', '4211', '2079']

SOLUTION: 12030

PROBLEM: ['4223', 'j', '8307', 'b', '1353']

SOLUTION:
13883