#include <algorithm>
#include <functional>

#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>

#include <vector>
#include <string>

using namespace std;

char buffer[ 1000 ];

int main( void )
{
    string sol;
    int n; scanf( "%d", &n );

    for( int i = 0; i < n; ++i ) {
        scanf( "%s", buffer ); string S = buffer;

        int Slen = S.size();
        int sollen = sol.size();

        for( int kol = min( Slen, sollen ); kol >= 0; --kol ) {
            if( kol == 0 ) {
                sol += S;
                break;
            }

            if( sol.substr( sollen-kol ) == S.substr( 0, kol ) ) {
                if( kol != Slen )
                    sol += S.substr( kol );
                break;
            }
        }       
    }

    puts( sol.c_str() );

    return (0-0);
}