Unique Words
Completed
Read a line of words and print how many different words it has (case-insensitive), then the unique words sorted alphabetically.
Input
One line.
Output
Two lines.
Example
Input
the cat The dog CAT
Output
3 cat dog the
Editor
Python
Hints
A set keeps only one copy of each value.
Sets are unordered - sort before printing.
Solution explanation
Sets have no order, so always sorted() them when the output must be predictable.
Show solution
words = {w.lower() for w in input().split()}
print(len(words))
print(*sorted(words))