#include<bits/stdc++.h>
using namespace std;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int Q, K;
    cin >> Q >> K;
    priority_queue<long long, vector<long long>, less<long long>> Ls;
    priority_queue<long long, vector<long long>, greater<long long>> Rs;
    int q;
    long long v;
    while (Q--){
        cin >> q;
        if (q == 1){
            cin >> v;
            if (Ls.size() < K){
                Ls.push(v);
            }else if (Ls.top() <= v){
                Rs.push(v);
            }else{
                Rs.push(Ls.top());
                Ls.pop();
                Ls.push(v);
            }
        }else{
            if (Ls.size() < K){
                cout << -1 << '\n';
            }else{
                cout << Ls.top() << '\n';
                Ls.pop();
                if (Rs.empty()) continue;
                Ls.push(Rs.top());
                Rs.pop();
            }
        }
    }
    return 0;
}