#include <iostream>
#include <iomanip>
#include <string>
#include <set>
#include <sstream>

using namespace std;

int main()
{
    string in;
    getline(cin,in);
    set<string> st;
    istringstream is(in);
    while(is >> in) st.insert(in);
    for(auto s: st) cout << s << " ";
}