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题目描述

输入一行单词序列，相邻单词之间由 1 个或多个空格间隔，请按照字典序输出这些单词，要求重复的单词只输出一次。（区分大小写）

输入格式

行单词序列，最少 1 个单词，最多 100 个单词，每个单词长度不超过 50，单词之间用至少 1 个空格间隔。数据不含除字母、空格外的其他字符。

输出格式

按字典序输出这些单词，重复的单词只输出一次。

输入样例数据 1

She wants to go to Peking University to study Chinese

输出样例数据 1

Chinese

Peking

She

University

go

study

to

wants

数据范围与提示