#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979323846;

int main(){
    int q,k;
    cin >> q >> k;
    priority_queue<ll> pqk;
    priority_queue<ll,vector<ll>,greater<ll>> pq;
    rep(i,q){
        int t;
        cin >> t;
        if(t==1){
            ll v;
            cin >> v;
            if(pqk.size()>=k) pq.push(v);
            else pqk.push(v);
        }else{
            if(pqk.size()==k){
                cout << pqk.top() << endl;
                pqk.pop();
                if(pq.size()>0){
                    pqk.push(pq.top());
                    pq.pop();
                }
            }else{
                cout << -1 << endl;
            }
        }
    }
    return 0;
}