#![allow(dead_code, unused_variables, unused_macros)] fn main() { input!(n:usize,k:usize,s:String); let (a, b) = s.split_at(k - 1); let a = if (n - k + 1) % 2 == 0 { a.to_string() } else { a.chars().rev().collect() }; println!("{}{}", b, a); } mod xxx { // https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8 #[macro_export] macro_rules! input { (source = $s:expr, $($r:tt)*) => { input_inner!{$s, $($r)*} }; ($($r:tt)*) => { let stdin = std::io::stdin(); let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock())); let mut next = move || -> String{ bytes .by_ref() .map(|r|r.unwrap() as char) .skip_while(|c|c.is_whitespace()) .take_while(|c|!c.is_whitespace()) .collect() }; input_inner!{next, $($r)*} }; } #[macro_export] macro_rules! input_inner { ($next:expr) => {}; ($next:expr, ) => {}; ($next:expr, mut $var:ident : $t:tt $($r:tt)*) => { let mut $var = read_value!($next, $t); input_inner!{$next $($r)*} }; ($next:expr, $var:ident : $t:tt $($r:tt)*) => { let $var = read_value!($next, $t); input_inner!{$next $($r)*} }; } #[macro_export] macro_rules! read_value { ($next:expr, ( $($t:tt),* )) => { ( $(read_value!($next, $t)),* ) }; ($next:expr, [ $t:tt ; $len:expr ]) => { (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>() }; ($next:expr, chars) => { read_value!($next, String).chars().collect::<Vec<char>>() }; ($next:expr, usize1) => { read_value!($next, usize) - 1 }; ($next:expr, bits)=>{ u64::from_str_radix(&$next(), 2).expect("Parse error") }; ($next:expr, hexs)=>{ u64::from_str_radix(&$next(), 16).expect("Parse error") }; ($next:expr, $t:ty) => { $next().parse::<$t>().expect("Parse error") }; } }