On the 4th row you should have:
for i in set(wlo):
Because you are trying to loop through the original input string with the cases intact.
This still doesn't fix the code but at least it's one step in the right direction
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On the 4th row you should have:
for i in set(wlo):
Because you are trying to loop through the original input string with the cases intact.
This still doesn't fix the code but at least it's one step in the right direction