#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int (i)=(0);(i)<(int)(n);++(i))
using ll = long long;
using P = pair<int, int>;
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#include<ext/pb_ds/tag_and_trait.hpp>
using namespace __gnu_pbds;
using namespace std;

template<class T> void vin(vector<T>& v, int n) {
    v.resize(n);
    for (int i = 0; i < n; ++i) {
        cin >> v[i];
    }
}
template <typename T>
using gtree = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;

int main() {
    gtree<pair<int, int>> g;
    int Q, K;
    cin >> Q >> K;
    rep(i, Q) {
        int a;
        cin >> a;
        if (a == 1) {
            int b;
            cin >> b;
            g.insert(make_pair(b, i));
        }
        else {
            if ((int)g.size() < K) {
                cout << -1 << endl;
                continue;
            }
            auto itr = g.find_by_order(K-1);
            cout << (*itr).first << endl;
            g.erase(itr);
        }
    }
    return 0;
}