use std::str::SplitWhitespace;
use std::str::FromStr;
use std::io::BufWriter;
use std::io::Write;
use std::io::Read;
struct Scanner<'a> {
    it: SplitWhitespace<'a>,
}

impl<'a> Scanner<'a> {
    pub fn next<T: FromStr>(&mut self) -> T {
        self.it.next().unwrap().parse::<T>().ok().unwrap()
    }
}

use std::collections::BinaryHeap;
use std::cmp::Reverse;

fn run() {
    let s = {
        let mut s = String::new();
        std::io::stdin().read_to_string(&mut s).unwrap();
        s
    };
    let mut sc = Scanner {it: s.split_whitespace()};
    let out = std::io::stdout();
    let mut out = BufWriter::new(out.lock());
    let q: usize = sc.next();
    let k: usize = sc.next();
    let mut small = BinaryHeap::new();
    let mut large = BinaryHeap::new();
    for _ in 0..q {
        let op: u8 = sc.next();
        if op == 1 {
            let v: u64 = sc.next();
            small.push(v);
            if small.len() >= k {
                large.push(Reverse(small.pop().unwrap()));
            }
        } else if let Some(Reverse(v)) = large.pop() {
            writeln!(out, "{}", v).unwrap();
        } else {
            writeln!(out, "-1").unwrap();
        }
    }
}

fn main() {
    run();
}