use std::{cmp::Reverse, collections::BinaryHeap};

macro_rules! read_line {
    ($($xs: tt)*) => {
        let mut buf = String::new();
        std::io::stdin().read_line(&mut buf).unwrap();
        let mut iter = buf.split_whitespace();
        expand!(iter, $($xs)*);
    };
}

macro_rules! expand {
    ($iter: expr,) => {};
    ($iter: expr, mut $var: ident : $type: tt, $($xs: tt)*) => {
        let mut $var = value!($iter, $type);
        expand!($iter, $($xs)*);
    };
    ($iter: expr, $var: ident : $type: tt, $($xs: tt)*) => {
        let $var = value!($iter, $type);
        expand!($iter, $($xs)*);
    };
}

macro_rules! value {
    ($iter:expr, ($($type: tt),*)) => {
        ($(value!($iter, $type)),*);
    };
    ($iter: expr, [$type: tt; $len: expr]) => {
        (0..$len).map(|_| value!($iter, $type)).collect::<Vec<_>>()
    };
    ($iter: expr, Chars) => {
        value!($iter, String).chars().collect::<Vec<_>>>()
    };
    ($iter: expr, $type: ty) => {
        if let Some(v) = $iter.next() {
            v.parse::<$type>().ok()
        } else {
            None
        }
    };
}

fn main() {
    read_line! {
        q: usize, k: usize,
    }
    let (q, k) = (q.unwrap(), k.unwrap());

    let mut pql = BinaryHeap::new();
    let mut pqr = BinaryHeap::new();

    for _ in 0..q {
        read_line! {
            t: usize, v: usize,
        }
        let t = t.unwrap();

        if t == 1 {
            let v = v.unwrap();

            if pql.len() < k {
                pql.push(v);
            } else {
                pql.push(v);
                pqr.push(Reverse(pql.pop().unwrap()));
            }
        } else {
            if pql.len() < k {
                println!("-1");
            } else {
                println!("{}", pql.pop().unwrap());
                if let Some(Reverse(u)) = pqr.pop() {
                    pql.push(u);
                }
            }
        }
    }
}