#include <bits/stdc++.h>
#include<atcoder/all>
#define int long long
#define double long double
using namespace std;
int size(int number){
    string numstr=to_string(number);
    return numstr.size();
}
signed main(void){
    int N;
    string S;
    cin>>N>>S;
    S.erase(--(S.end()));
    S.erase(S.begin());
    cout<<S<<endl;
}