#include<bits/stdc++.h>
#define ALL(v) std::begin(v),std::end(v)
using lint=long long;
using ld=long double;
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    lint n,k;std::cin>>n>>k;
    std::string s;std::cin>>s;
    std::string t=s.substr(k-1,n-k+1);
    std::string u=s.substr(0,k-1);
    if((n-k+1)%2)std::reverse(ALL(u));
    std::cout<<t<<u<<'\n';
}