#include <bits/stdc++.h>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-8;
const ull mod=1e9+7;
const int dx[4]={-1,0,1,0},dy[4]={0,-1,0,1};

ll n,k;
priority_queue<ll> q1,q2;

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin>>n>>k;
	for(int i=0;i<n;i++){
		ll t;
		cin>>t;
		if(t==1){
			ll A;
			cin>>A;
			q1.push(A);
			if(q1.size()>k){
				ll B=q1.top();
				q1.pop();
				q2.push(-B);
			}
		}
		else{
			if(q1.size()<k) cout<<-1<<endl;
			else{
				cout<<q1.top()<<endl;
				q1.pop();
				if(q2.size()){
					ll B=-q2.top();
					q2.pop();
					q1.push(B);
				}
			}
		}
	}
}