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: ['D', '1259', '8927', '3345', '553', '7209', '2507', 'l', 'o', '7317', '1227', '6749', 'S', '3171', 'I', '197', '9577', 'j', 'Q']

SOLUTION: 52038

PROBLEM: ['7361', '6913', '3605', '2081', '7619']

SOLUTION: 27579

PROBLEM: ['Y', '9495', 'b', 'F', 'S', '5943', '8921', '1729', 'G', 'Y', '3789', '3925', '815', '8499', '4009', '7911', '8139', '3057', 'q']

SOLUTION:
66232