#include <set>
#include <iostream>
#include <string>
#include <algorithm>
#include <iterator>

int main()
{
  std::set<std::string> myset(std::istream_iterator<std::string>(std::cin), std::istream_iterator<std::string>());
  std::copy(myset.begin(), myset.end(), std::ostream_iterator<std::string>(std::cout, "\n"));
  return 0;
}