Coding is the closest thing we have to superpower ！
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）
一行单词序列，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。
按字典序输出这些单词，重复的单词只输出一次。
She wants to go to Peking University to study Chinese
Chinese Peking She University go study to wants