#include <bits/stdc++.h>
using namespace std;

int main()
{
    cin.tie(nullptr); ios::sync_with_stdio(false);

    int N, K; cin >> N >> K;
    string a; a.resize(K-1); for (auto& c : a) cin >> c; 
    string b; cin >> b;

    if ((N-K+1) & 1) reverse(a.begin(), a.end());

    cout << b << a << endl;
}