#include <algorithm>
#include <iostream>
#include <stack>
#include <queue>
#include <cmath>
#include <string>
#include <iterator>
#include <map>
#include <set>
#include <iomanip>
#include <vector>
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
using Graph = vector<vector<int>>;
int dx[] = {0, 1, 0, -1};
int dy[] = {1, 0, -1, 0};
#define INF 1000000000000000000
#define MAX 200001
#define MOD 1000000007

int main(){
    int Q, K;
    cin >> Q >> K;
    vector<ll> ans;
    priority_queue<ll> zen;
    priority_queue<ll, vector<ll>, greater<ll>> kou;
    for(int i = 0; i < Q; i++){
        int type; 
        cin >> type;
        if(type == 1){
            ll v;
            cin >> v;
            if(zen.size() < K) zen.push(v);
            else{
                ll u = zen.top();
                if(v < u){
                    zen.pop();
                    kou.push(u);
                    zen.push(v);
                }
                else{
                    kou.push(v);
                }
            }
        }
        else{
            if(zen.size() == K){
                ll a = zen.top();
                zen.pop();
                ans.push_back(a);
                if(kou.size() != 0){
                    zen.push(kou.top());
                    kou.pop();
                }
            }
            else{
                ans.push_back(-1);
            }
        }
    }
    for(int i = 0; i < ans.size(); i++) cout << ans[i] << endl;
}