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: ['P', '6161', 'k', '5925', 'h', 'G', 'n']

SOLUTION: 12086

PROBLEM: ['G', 'Z', '4819', '9763', '9987']

SOLUTION: 24569

PROBLEM: ['d', 'G', '7321', 'l', '5335', '7803', '7129', '6803', 'T', '3237', 'r', '879', '79', 'k']

SOLUTION:
38586