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: ['9863', 'y']

SOLUTION: 9863

PROBLEM: ['k', 'a']

SOLUTION: 0

PROBLEM: ['9405', 'q', '6719', '1867', '1033', '9033', 's', 'K', '4477', '4373', 't', '1519', 'c', 'b', '2419']

SOLUTION:
40845