{"trustable":false,"sections":[{"title":"Description","value":{"format":"HTML","content":"HH学长刚刚立下了再不过CET就直播xx的flag,为了不真的开启直播模式,HH学长决定好好学习英语。于是他每天都读一篇只包含生词的英语文章,并以自己高达450的智商在一秒钟之内记忆下来。\u003cbr\u003e\u003cbr\u003e\n现在给你一篇HH学长今天要读的文章,请你写一个程序,输出他都学习到了哪些单词。\u003cbr\u003e\n要求:如果文章中有相同的单词,那么仅仅输出一次;而且如果两个单词只有大小写不同,将他们视为相同的单词。"}},{"title":"Input","value":{"format":"HTML","content":"测试数据将输入一篇文章。不超过5000行,每一行最多200个字符,并以EOF结束。"}},{"title":"Output","value":{"format":"HTML","content":"按照字典序输出他学到的单词,每行输出一个单词,\u003cb\u003e输出单词时所有的字母全部小写\u003c/b\u003e。\n\u003cbr\u003e数据保证最多有5000个需要输出的单词。"}},{"title":"Sample Input","value":{"format":"HTML","content":"样例输入①\n\u003cpre\u003ea a a a a a a a, a a a a a a.\na a a a b a a a. a? a!!!\u003c/pre\u003e\n\u003chr /\u003e\n样例输入②\n\u003cpre\u003eAdventures in Disneyland\n\nTwo blondes were going to Disneyland when they came to a fork in the\nroad. The sign read: \"Disneyland Left.\"\n\nSo they went home.\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"样例输出①\n\u003cpre\u003ea\nb\u003c/pre\u003e\n\u003chr /\u003e\n样例输出②\n\u003cpre\u003ea\nadventures\nblondes\ncame\ndisneyland\nfork\ngoing\nhome\nin\nleft\nread\nroad\nsign\nso\nthe\nthey\nto\ntwo\nwent\nwere\nwhen\u003c/pre\u003e"}},{"title":"Hint","value":{"format":"HTML","content":"输入可能包含标点符号,但标点符号显然不能算作单词的一部分。"}},{"title":"","value":{"format":"HTML","content":""}}]}