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


fn main() {
    let mut qk = String::new();
    std::io::stdin().read_line(&mut qk).ok();
    let qk: Vec<usize> = qk.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let q = qk[0];
    let k = qk[1];
    let queries = (0..q).map(|_| {
            let mut temp = String::new();
            std::io::stdin().read_line(&mut temp).ok();
            let temp: Vec<usize> = temp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
            temp
        })
        .collect::<Vec<_>>();

    let mut targets = BinaryHeap::new();
    let mut rests = BinaryHeap::new();
    for v in queries.iter() {
        if v[0] == 1 {
            targets.push(v[1]);
            if targets.len() > k {
                rests.push(Reverse(targets.pop().unwrap()));
            }
        } else {
            if targets.len() == k {
                println!("{}", targets.pop().unwrap());
                if let Some(Reverse(val)) = rests.pop() {
                    targets.push(val);
                }
            } else {
                println!("-1");
            }
        }
    }
}