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: ['2913', 'b', 'j', '7591', 'O', 's', '5589', '4995', '7503', 'U', 'S', 'C', '6797']

SOLUTION: 35388

PROBLEM: ['D', 'b', 'h', 'p', '1637']

SOLUTION: 1637

PROBLEM: ['h', 'k', 'W', 'V', 'o', '1833', 'H', 'x', '3773', '8379', 'g', '3069', '9083', '6663', 'H', '4067', 'o']

SOLUTION:
36867