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: ['238', 'h', '92', 'U', '2799']
Example solution: 3129
Example explanation: Here, the numbers in the input list are '238', '92' and '2799', hence their sum (238+92+2799) is 3129.

Problem: ['9533', '8165', '1333', 'w', '4921', '9821', '4745', '9139', '4685', '7127', 'u', 'k', '3923']

Solution: 63392