Detailed 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.
See one example below:
Problem: ['238', 'h', '92', 'U', '2799']
Solution: 3129
Explanation: Here, the numbers in the input list are '238', '92' and '2799', hence their sum (238+92+2799) is 3129.

Problem: ['V', 'W', '2139', '5433', 'N', '1019', '2409', '4713', '3831', '3419', '627', '6741', 'k', '9', '8839', '6045', '6799', '775', 'F', 'n']
Solution:
52798