#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll inf=144499999999994;
ll mod=1000000007;
int main(){
    ll n;
    cin >> n;
    string s;
    cin >> s;
    for (ll i = 1; i < s.size()-1; i++)
    {
        cout << s[i];
    }
    cout << endl;
}