#include using namespace std; typedef long long ll; typedef pair pii; #define pb push_back #define mp make_pair #define rep(i,n) for(int i=0;i<(n);++i) int main(){ cin.tie(0); ios::sync_with_stdio(false); int n;cin >> n; string ans=""; rep(i,n){ string t;cin >> t; ans+=t; } cout << ans << endl; }