use std::{
    collections::{BTreeSet, HashMap, HashSet, VecDeque},
    fmt::Debug,
    io::stdin,
    str::FromStr,
};

use proconio::marker::Chars;

fn main() {
    // proconio::input! {
    //     q: usize,
    //     k: usize,
    // }
    let x = read::<u64>();
    let (q, k) = (x[0], x[1]);
    let mut query = (0..q)
        .flat_map(|_| read::<u64>())
        .enumerate()
        .map(|v| (v.1, v.0));
    let mut s = BTreeSet::new();
    while let Some(q) = query.next() {
        match q.0 {
            1 => {
                let val = query.next().unwrap();
                s.insert(val);
            }
            2 => {
                if s.len() < k as usize {
                    println!("-1");
                } else {
                    let val = s.iter().skip(k as usize - 1).next().unwrap().clone();
                    println!("{}", val.0);
                    s.remove(&val);
                }
            }
            _ => unreachable!(),
        }
    }
}

fn read<T>() -> Vec<T>
where
    T: FromStr,
    <T as std::str::FromStr>::Err: Debug,
{
    let mut s = String::new();
    stdin().read_line(&mut s).unwrap();
    s.split(' ').map(|v| v.trim().parse().expect(v)).collect()
}