#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream>
#include<map>
#include <iomanip>
#include <time.h>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
#include <cassert>
#include<fstream>
#include <cstdlib>
#define EVAL 1
using namespace std;
#define Ma_PI 3.141592653589793
#define eps 0.00000001
#define LONG_INF 3000000000000000000
#define GOLD 1.61803398874989484820458
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
#define seg_size 524288
#define PI 3.1415926535
using namespace std;
int main(){
#define int long long
	iostream::sync_with_stdio(false);
	int query,k;
	cin >> query >> k;
	set<long long> over_k;
	set<long long> under_k;
	map<long long,long long> over_wow,under_wow;
	REP(i,query){
		long long a;
		cin >> a;
		if(a == 1){
			cin >> a;
			if(i + 1LL < k){
				under_k.insert(a);
				under_wow[a]++;
			}else{
				auto hoge = under_k.end();
				if(k == 1) goto foo;
				hoge--;
				if(*hoge <= a){
					foo:;
					over_wow[a]++;
					over_k.insert(a);
				}else{
					under_k.insert(a);
					under_wow[*hoge]--;
					if(under_wow[*hoge] == 0){
						under_k.erase(*hoge);
					}
					over_k.insert(*hoge);
					over_wow[*hoge]++;
				}
			}
		}else{
			if(over_k.size() != 0){
				auto hoge = over_k.begin();
				cout << *hoge << endl;
				over_wow[*hoge]--;
				if(over_wow[*hoge] == 0){
					over_k.erase(*hoge);
				}
			}else{
				cout << -1 << endl;
			}
		}
	}
	return 0;
}