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: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']

SOLUTION: 17925

PROBLEM: ['2087', '8171', 'c', 'd', 'a', '5621', 'n']

SOLUTION: 15879

PROBLEM: ['6365', '5873', 'S', '6141', 'F', 'I', 'U']

SOLUTION:
18379