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: ['8609', '8045', '2517', '3821', 'x', '3895', 't']

SOLUTION: 26887

PROBLEM: ['4749', '1169', '4273', 'X']

SOLUTION: 10191

PROBLEM: ['S', 'r', '1097', 'I', '8033', '5999', 'W', '2449', 'k', '3355', '9383', 'J']

SOLUTION:
30316