Instructions: 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.
Input: ['4501', '4425', 'N', 'S', '4467', '3629', '5551', '1545', 'p']
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
24118