#include <iostream>
#include <set>
#include <fstream>
#include <string>

using namespace std;

int main()
{
	ifstream input;
	input.open("input.txt");
	string s;
	set <string> ans;
	pair <string, int> num;
	num.second = 0;
	num.first = "";
	while (!input.eof()) {
		input >> s;
		if (isdigit(s[0]) && num.second == 0) {
			num.first = s;
			num.second = 1;
		}
		else if (s == num.first) {
			num.second++;
		}
	}
	for (set<string>::iterator it = ans.begin(); it != ans.end(); it++) {
		cout << *it << " ";
	}

}