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: ['n', 'W', '565', '6625', '903', 'o', '7995', '8339', '5251', 'e', 'a', '1081', '5813', 'o']

SOLUTION: 36572

PROBLEM: ['7755', '8383', 'y', 'k', '4869', '2809']

SOLUTION: 23816

PROBLEM: ['9539', '7571', '4841', '2855', 'h', 'p']

SOLUTION:
24806