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: ['2097', '7815', 'f', '1705', '7553', 'C', 'n', '7091', '1253', 'z', '9229', 'H', 'N', '6481', 'H', 'M', 'G', '4527', '8537']

SOLUTION: 56288

PROBLEM: ['9509', 'o', 'l', '9873', 'h', 'N', '2059', '8595', 'D', 'L', '5913', 'o', '1443', 'C', 'y', 'K', 'J', 'a', 'X', 'E']

SOLUTION: 37392

PROBLEM: ['1505', 'x', 'u', 'D', 'n', 'p', 'a', 'J', '675', '2781', '5683', '2935', 'p', '8377', 'U', 'J']

SOLUTION:
21956