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#include <bits/stdc++.h>
using namespace std;
set<string> dict;
int main() {
string s, b;
while (cin >> s) {
for (int i = 0; i < s.length(); i++) {
if (isalpha(s[i]))//isalpha（）判断是不是英文字符
{
s[i] = tolower(s[i]);//将大写转换为小写
} else
s[i] = ' ';
}
stringstream ss(s);//从string对象str中读取字符，头文件#include<sstream>
//有空格就是下一个
while (ss >> b)
dict.insert(b);//将b输入set中
//迭代输出
for (set<string>::iterator p = dict.begin(); p != dict.end(); p++)//迭代器，有点像指针
cout << *p << endl;
return 0;
