#include <bits/stdc++.h>
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

int main() {
    int q, k;
    cin >> q >> k;
    ordered_set<pair<long long, int>> s;
    int id = 0;
    while (q--) {
        int t;
        cin >> t;
        if (t == 1) {
            long long v;
            cin >> v;
            s.insert({v, id++});
        } else {
            if ((int)s.size() < k) {
                cout << -1 << '\n';
            } else {
                auto it = s.find_by_order(k - 1);
                cout << it->first << '\n';
                s.erase(it);
            }
        }
    }
}