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: ['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']

SOLUTION: 50770

PROBLEM: ['q', 'U', 'I', '5245', 'g', 'Y', 's', 'V', 'b', 'V', 'D', '1193', 'p']

SOLUTION: 6438

PROBLEM: ['5085', '1069', '2887', 'q', '197', '8425', '9451', '3401', '4251', '9599', 'C', 'l', '195', 'W', '5403', '1415', 'q']

SOLUTION:
51378