#include <iostream>
#include <string>
#include <list>
#include <sstream>
#include <algorithm>
using namespace std;

void insertToPlace(list<string>* v, const string* word){
	if(!v->size() || *word < v->front()){
		v->push_front(*word);
		return;
	}
	if(*word == v->front()){
		return;
	}
	for(list<string>::iterator it = next(v->begin()); it != v->end(); it++){
		if(*word == *it){
			return;
		}
		if(*word > *prev(it) && *word < *it){
			v->insert(it, *word);
			return;
		}
	}
	v->push_back(*word);
}

int main(){
	ios::sync_with_stdio(false);

	cout<<"Introduce a line: ";
	string line;
	getline(cin, line);

	list<string> v;

	istringstream sstream(line);
	string word;
	while(getline(sstream, word, ' ')){
		insertToPlace(&v, &word);
	}

	cout<<"Distinct words ordered alphabetically:\n";
	for(list<string>::iterator it = v.begin(); it != v.end(); it++){
		cout<<*it<<"\n";
	}

	cout.flush();

	return 0;
}