#include "bits/stdc++.h"
#define ALL(obj) (obj).begin(),(obj).end()
#define RALL(obj) (obj).rbegin(),(obj).rend()
#define REP(i, n) for(int i = 0; i < int(n); i++)
#define FOR(i,n,m) for(int i = int(n); i < int(m); i++)
using namespace std;
typedef long long ll;
const int MOD = 1e9 + 7;
const int INF = MOD - 1;
const ll LLINF = 4e18;

int main() {
    int q, k; cin >> q >> k;
    priority_queue<ll> pq1;
    priority_queue < ll, vector <ll> , greater<ll>> pq2;
    REP(i, q) {
        int p; cin >> p;
        if (p == 1) {
            ll v; cin >> v;
            pq1.push(v);
            if (pq1.size() > k) {
                pq2.push(pq1.top()); pq1.pop();
            }
        }
        else {
            if (pq1.size() >= k) {
                cout << pq1.top() << endl;
                pq1.pop();
                if (pq2.size() > 0) {
                    pq1.push(pq2.top());
                    pq2.pop();
                }
            }
            else {
                cout << -1 << endl; 
            }
        }
    }
}