Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
['238', 'h', '92', 'U', '2799']
Solution: 3129
Reason: Here, the numbers in the input list are '238', '92' and '2799', hence their sum (238+92+2799) is 3129.

Now, solve this instance: ['L', '4829', '7881', 'y', 'Y', '9205', 'H', 'K', 'g', 'M', 'y', '951', '4981', '5719', 'X', '3791', '3125']
Student:
40482