#include #include #include #include #include #include #include #include #include using namespace std; #define ok printf("ok\n"); #define ok1 printf("ok1\n"); #define ok2 printf("ok2\n"); #define MAX 1000000 #define rep(i,n) for(int i=0;i=0;i--) #define REPR(i,s,n) for(int i=(s);i>=(g);(i)--) #define all(a) (a).begin(),(a).end() #define reall(a) (a).rbegin(),(a).rend() #define pb push_back typedef vector vi; typedef vector vs; typedef long long ll; typedef vector vll; int facctorialMethod(int k); int gcd(int a, int b); int main() { vs s; int a; string t,u; cin >> a; rep(i,a) { cin >> t; u+=t; } cout << u; return 0; }