/*

	ZOJ 1825

	Emerald

	Tue 12 May 2015

*/

#include <iostream>

#include <cstring>

#include <cstdio>

#include <string>

#include <set>

using namespace std;

int main() {

	set <string> dict; // a set contains the inputting wotd

	string word;

	while( cin >> word ) {

		dict.insert( word );

	}

	set <string> :: iterator it;

	for( it = dict.begin(); it != dict.end(); it ++ ) {

		for( int i=1; i < it->length(); i++ ) { // it->substr( pos, len ) : split a string from the pos of the origin

											// string, and the splitted string's length is len

			if( dict.count( it->substr( 0, i ) ) && dict.count( it->substr( i, it->length() - i ) ) ) {

				printf( "%s\n", it->c_str() ); // print the compound word

				break; // break, or else this string may be printed again

			}

		}

	}

	return 0;

}