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: ['1869', 'q', '5919', 'D', '7733', '2641', 'h', '1327']

SOLUTION: 19489

PROBLEM: ['6669', 'n', 't', 'N', 'x', '8153', 'W', 'v', 'B', '3181', 'y', 'e', '3491']

SOLUTION: 21494

PROBLEM: ['V', 'c', '7359', '1597', '4037', 'K', 'T', 'J', 'v', 'i', 'I', 'D', 'Z', '5537', '57', 'I']

SOLUTION:
18587