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: ['6051', '5303', '1509', '2797', 'Z', '4777', '721', '8563', 'K', '63', '9115', 'd', '7305', '9743', '7409']

SOLUTION: 63356

PROBLEM: ['q', '8155', 'L', 'v', '2657', 'X', 'v', '2353', '151', 'R', '967', '4327']

SOLUTION: 18610

PROBLEM: ['H', 'U', '5379', 'd', '2373', '6631', 'L', '3395', '3137', '5453', 'Q', 'w', 'y', '8273', '9763', 'e']

SOLUTION:
44404