描述

输入一个文本，找出所有不同的单词（连续的字母序列），按字典序从小到大输出，单词不区分大小写。

输入格式

输入文件是一个不超过 $500$ 行的文本文件。一个输入行不超过 $200$ 个字符。

输出格式

你的输出需要给出一个出现在文件中的不同单词的列表。所有单词以小写形式按字母顺序显示。你可以假设不同单词的个数不超过 $5000$。

输入样例 1

Adventures in Disneyland
Two blondes were going to Disneyland when they came to a fork in the
road. The sign read: "Disneyland Left."
So they went home.

输出样例 1

a
adventures
blondes
came
disneyland
fork
going
home
in
left
read
road
sign
so
the
they
to
two
went
were
when