#include <iostream>
#include <string>
#include <algorithm>
#include <iterator>
#include <vector>
using namespace std;

int main()
{
    /* create a string vector
     * - initialized by all words from standard input
     */
    vector<string> coll((istream_iterator<string>(cin)),
                        istream_iterator<string>());

    // sort elements
    sort (coll.begin(), coll.end());

    // print all elements ignoring subsequent duplicates
    unique_copy (coll.begin(), coll.end(),
                 ostream_iterator<string>(cout, "\n"));
}
