List problem "TypeError: must be str, not int"

[RedSkeleton007]

I'm trying to print the elements of a list of strings to test Python's sorting methods, but it's complaining about data types:

#!/usr/bin/env python3
#ListSorting.py

def stringListSort():
    upperAndLowerSort = ["chicken", "pig", "Dink", "cow"]
    upperAndLowerSort.sort()
    for i in upperAndLowerSort:
        print(str(i))#print(upperAndLowerSort[i])
        i += 1
    keyArgSort = ["chicken", "pig", "Dink", "cow"]
    keyArgSort.sort(key=str.lower)
    for i in keyArgSort:
        print(i)
        i += 1

def main():
    stringListSort()

main()

Error:
========= RESTART: I:/Python/Python36-32/SamsPrograms/ListSorting.py =========
Dink
Traceback (most recent call last):
  File "I:/Python/Python36-32/SamsPrograms/ListSorting.py", line 19, in <module>
    main()
  File "I:/Python/Python36-32/SamsPrograms/ListSorting.py", line 17, in main
    stringListSort()
  File "I:/Python/Python36-32/SamsPrograms/ListSorting.py", line 9, in stringListSort
    i += 1
TypeError: must be str, not int
>>> 

I understand that I'm not printing integer elements, but how do I get it to print the string elements via their list index?
And why is "Dink" the only thing printing out before generating an error?