#include <iostream>
#include <set>
#include <vector>

using namespace std;
using ll = long long;
using vll = vector<ll>;

struct DynamicMultiset {
    multiset<ll> small;   // smallは昇順で要素を保持するmultiset
    multiset<ll> large;   // largeは昇順で要素を保持するmultiset
    int K;                // k番目に小さい値の管理数

    void add(ll value) {
        if (small.size() < K) {
            small.insert(value);
        } else {
            ll current_kth = *(--small.end());
            if (value < current_kth) {
                small.erase(--small.end());
                small.insert(value);
                large.insert(current_kth);
            } else {
                large.insert(value);
            }
        }
    }

    ll getKthSmallest() {
        if (small.size() < K) {
            return -1;
        }
        return *(--small.end());
    }

    void remove() {
        if (small.size() < K) {
            return;
        }
        ll current_kth = *(--small.end());
        small.erase(--small.end());
        if (!large.empty()) {
            ll next_kth = *large.begin();
            large.erase(large.begin());
            small.insert(next_kth);
        }
    }
};



using ll = long long;
using vll = vector<long long>;

int main() {
    DynamicMultiset dm;
    int Q, K;
    cin >> Q >> K;
    dm.K = K;
    vll ans;

    for (int i = 0; i < Q; ++i) {
        int T;
        cin >> T;
        if (T == 1) {
            ll V;
            cin >> V;
            dm.add(V);
        } else {
            ll kthSmallest = dm.getKthSmallest();
            ans.push_back(kthSmallest);
            dm.remove();
        }
    }

    for (int i = 0; i < ans.size(); ++i) {
        cout << ans[i] << endl;
    }

    return 0;
}