Radix-Sort which works with str(numbers) got problem with uneven elements

So i need to implement an radix sort function with works with str numbers inside my list, so i thought myself i get myself the max digits of the biggest number of my list and just do the basic radic sort only with the change that i work with string indices, my function works but only for numbers in the same length like l = [100,356,200,605], i got some probems with lists like this l = [5,70,230,2,10]