#include <iostream>
#include <string>
using namespace std;

void spaceCount(string, int*);
void showWords(string[],int);

int main(){
	string fullString;

	int fSpace = 0, point = 0, each = 0, pos, indef = 0, numb = 0;

	cout << "type a sentense :\n";
	getline(cin,fullString);
	fullString += ' ';
	spaceCount(fullString,&fSpace);

	string *words = new string[fSpace];

	do {
		pos = fullString.find(" ");
		words[each] = fullString.substr(point, pos);
		fullString.erase(point, pos + 1);
		each++;
	} while (!fullString.empty());

	for (int i = 0; i < each-1; i++){
		for (int j = i + 1; j < each; j++){
			if (words[i] == words[j]){
				words[i].clear();
				words[j].clear();
				indef++;
			}
		}
	}

	for (int k = 0; k < each; k++){
		for (int i = 0; i < words[k].length(); i++){
			for (int j = i + 1; j < words[k].length(); j++){
				if (words[k].at(i) == words[k].at(j)){
					words[k].at(j) = 0;
					words[k].at(i) = 0;
				}
			}
		}
	}

	showWords(words, each);
	delete []words;

	system("pause");
	return 0;
}

void spaceCount(string currString,int *space){
	for (int i = 0; i < currString.length(); i++){
		if (currString.at(i) == ' ')
			*space += 1;
	}
}
void showWords(string word[],int eac){

	for (int i = 0; i < eac; i++)
		cout << word[i] << " ";

}