#define _CRT_SECURE_NO_WARNINGS #include <iostream> #include <string> #include <vector> #include <cmath> #include <fstream> #include <set> #include <utility> #include <algorithm> #include <queue> #include <stack> #include <deque> #include <numeric> #include <sstream> #include <list> #include <map> #include <stdlib.h> #include <time.h> #define rep(i,p,n) for(int i=(int)p;i<(int)n;i++) #define repp(i,p,n) for(int i=(int)p;i>=(int)n;i--) #define Sort(x) sort(x.begin(),x.end()); #define ll long long #define INF 2000000000 using namespace std; int main() { string s, ss; int n; cin >> n>>s; rep(i, 1, n) { cin >> ss; s += ss; } cout << s << endl; return 0; }