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.

Example input: ['238', 'h', '92', 'U', '2799']
Example output: 3129
Example explanation: Here, the numbers in the input list are '238', '92' and '2799', hence their sum (238+92+2799) is 3129.
Q: ['S', 'B', '1549', '763', 'B', '5089', '7801', '9737', '6425', '415', '8749', 'J', 'z']
A:
40528