use input::input_array;
use input::input_vec;
use std::cmp::Reverse;
use std::collections::BinaryHeap;

fn main() {
    let [q, k] = input_array::<usize, 2>();
    let k = k - 1;
    let mut topk = BinaryHeap::<Reverse<usize>>::new();
    let mut others = BinaryHeap::<usize>::new();
    for _ in 0..q {
        let query = input_vec::<usize>();
        match query[0] {
            1 => {
                let x = query[1];
                topk.push(Reverse(x));
                if k < topk.len() {
                    others.push(topk.pop().unwrap().0);
                }
            }
            2 => {
                let ans = others.pop().map_or_else(|| -1, |x| x as isize);
                println!("{}", ans);
            }
            _ => unreachable!(),
        }
    }
}
// input {{{
#[allow(dead_code)]
mod input {
    use std::cell::Cell;
    use std::convert::TryFrom;
    use std::io::stdin;
    use std::io::BufRead;
    use std::io::BufReader;
    use std::io::Lines;
    use std::io::Stdin;
    use std::str::FromStr;
    use std::sync::Mutex;
    use std::sync::Once;
    type Server = Mutex<Lines<BufReader<Stdin>>>;
    static ONCE: Once = Once::new();
    pub struct Lazy(Cell<Option<Server>>);
    unsafe impl Sync for Lazy {}
    fn line() -> String {
        static SYNCER: Lazy = Lazy(Cell::new(None));
        ONCE.call_once(|| {
            SYNCER
                .0
                .set(Some(Mutex::new(BufReader::new(stdin()).lines())));
        });
        unsafe {
            (*SYNCER.0.as_ptr())
                .as_ref()
                .unwrap()
                .lock()
                .unwrap()
                .next()
                .unwrap()
                .unwrap()
        }
    }
    pub trait ForceFromStr: FromStr {
        fn force_from_str(s: &str) -> Self;
    }
    impl<T, E> ForceFromStr for T
    where
        T: FromStr<Err = E>,
        E: std::fmt::Debug,
    {
        fn force_from_str(s: &str) -> Self { s.parse().unwrap() }
    }
    pub fn input_array<T: ForceFromStr, const N: usize>() -> [T; N]
    where
        T: std::fmt::Debug,
    {
        <[_; N]>::try_from(input_vec()).unwrap()
    }
    pub fn input_vec<T: ForceFromStr>() -> Vec<T> {
        line()
            .split_whitespace()
            .map(T::force_from_str)
            .collect::<Vec<_>>()
    }
    pub fn input<T: ForceFromStr>() -> T { T::force_from_str(&line()) }
}
// }}}