/*** author: yuji9511 ***/
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using lpair = pair<ll, ll>;
const ll MOD = 1e9+7;
const ll INF = 1e18;
#define rep(i,m,n) for(ll i=(m);i<(n);i++)
#define rrep(i,m,n) for(ll i=(m);i>=(n);i--)
#define printa(x,n) for(ll i=0;i<n;i++){cout<<(x[i])<<" \n"[i==n-1];};
void print() {}
template <class H,class... T>
void print(H&& h, T&&... t){cout<<h<<" \n"[sizeof...(t)==0];print(forward<T>(t)...);}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll N,K;
    string S;
    cin >> N >> K >> S;
    string ans = "";
    rep(i,K-1,N){
        ans += S[i];
    }
    if((N-K+1) % 2 == 0){
        rep(i,0,K-1) ans += S[i];
    }else{
        rrep(i,K-2,0) ans += S[i];
    }
    print(ans);
    

}