>>520
#include<iostream>
#include<string>
#include<set>

int main(void)
{
std::string str;
std::set<std::string> dic;

while(std::getline(std::cin, str))
{
dic.insert(str);
}

for(std::set<std::string>::iterator it=dic.begin();it!=dic.end();++it)
{
std::cout << *it << std::endl;
}

return 0;
}