#include<bits/stdc++.h>
using namespace std;
#define lo long long
#define sr string
#define ch char
#define ve vector
#define al(x) x.begin(),x.end()
#define sort(x) sort(x.begin(),x.end())
#define reverse(x) reverse(x.begin(),x.end())
#define rep(i,a) for(lo i=0;i<a;i++)
#define lep(i,a) for(lo i=0;i<=a;i++)
#define rrep(i,a,b) for(lo i=a;i<b;i++)
#define rrrep(i,a,b) for(lo i=a;i>=b;i--)
#define wh while

int main(){
    lo n; cin>>n;
    ve<sr> s(n);
    sr S="";
    rep(i,n){
        cin>>s[i];
        S+=s[i];
    }
    cout<<S<<endl;
}