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

Now, solve this: ['6557', '6509', '9003', '1681', '7071', '2449', '7559', '3309', 'M']
Solution:
44138