#![allow(unused_imports)]
#![allow(non_snake_case)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let v = read_vec::<usize>();
    let (n, k) = (v[0], v[1]);
    let s = read::<String>().chars().collect::<Vec<_>>();

    let mut ans = (k - 1..n).map(|i| s[i]).collect::<Vec<_>>();
    if (n - k + 1) % 2 == 0 {
        for i in 0..k - 1 {
            ans.push(s[i]);
        }
    } else {
        for i in (0..k - 1).rev() {
            ans.push(s[i]);
        }
    }
    let ans = ans.iter().collect::<String>();
    println!("{}", ans);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}