#include <bits/stdc++.h>
#define _overload3(_1, _2, _3, name, ...) name
#define _rep(i, n) repi(i, 0, n)
#define repi(i, a, b) for (int i = (a); i < (b); ++i)
#define rep(...) _overload3(__VA_ARGS__, repi, _rep, )(__VA_ARGS__)
#define ALL(x) x.begin(), x.end()
#define chmax(x, y) x = max(x, y)
#define chmin(x, y) x = min(x, y)
using namespace std;
random_device rnd;
mt19937 mt(rnd());
using ll = long long;
using lld = long double;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using PII = pair<int, int>;
const int IINF = 1 << 30;
const ll INF = 1ll << 60;
const ll MOD = 1000000007;
int n, k;
string s;

string calc()
{
    string ret = s;
    rep(i, n - k + 1)
    {
        reverse(ret.begin() + i, ret.begin() + i + k);
    }
    return ret;
}

int main()
{
    cin >> n >> k;
    cin >> s;
    string ans = "";
    rep(i, k - 1, k - 1 + n)
    {
        ans += s[i % n];
    }
    if ((n + k) % 2 == 0)
    {
        reverse(ans.end() - k + 1, ans.end());
    }
    // cerr << calc() << endl;
    cout << ans << endl;
    //assert(ans == calc());
    return 0;
}