#include<bits/stdc++.h>
using namespace std;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long LL;
typedef pair<LL,LL> P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<typename T> T gcd(T a,T b){return b?gcd(b,a%b):a;}
const LL mod=998244353;
const LL LINF=1LL<<62;
const int INF=1<<30;
int dx[]={1,0,-1,0,1,-1,1,-1};
int dy[]={0,1,0,-1,1,-1,-1,1};



int main(){
    int n,k;cin >> n >> k;
    string s;cin >> s;
    string ans = "";
    for (int i = k-1; i < n; i++) {
        ans += s[i];
    }
    if(k % 2 == 0){
        for (int i = k-2; i >= 0; i--) {
            ans += s[i];
        }
    }
    else{
        for (int i = 0; i < k-1; i++) {
            ans += s[i];
        }
    }
    cout << ans << endl;
    return 0;
}