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: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']

SOLUTION: 15614

PROBLEM: ['8665', '6083', '9819', 'H', 'p', 'S', 'R', '4311', 'R', '7193']

SOLUTION: 36071

PROBLEM: ['8777', 'M', 'I', 'P', 'h', '791', '7487', 'V']

SOLUTION:
17055