use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();
    let k: usize = itr.next().unwrap().parse().unwrap();
    let s: Vec<char> = itr.next().unwrap().chars().collect();

    let mut out = Vec::new();
    let mut rev = Vec::new();
    for i in 0..n {
        if i < k - 1 {
            rev.push(s[i]);
        } else {
            write!(out, "{}", s[i]).ok();
        }
    }
    if (n - k + 1) % 2 == 1 {
        rev.reverse();
    }
    let s: String = rev.into_iter().collect();
    writeln!(out, "{}", s).ok();
    stdout().write_all(&out).unwrap();
}