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

int main() {
  int Q, K;
  cin >> Q >> K;

  multiset<int64_t> bag0;
  multiset<int64_t> bag1;
  while (Q--) {
    int P;
    cin >> P;
    if (P == 1) {
      int64_t V;
      cin >> V;
      bag0.insert(V);
      if (bag1.size() && *bag1.begin() < *--bag0.end()) {
        bag1.insert(*--bag0.end());
        bag0.erase(--bag0.end());
      }
    } else {
      if (bag0.size() == K) {
        cout << *--bag0.end() << endl;
        bag0.erase(--bag0.end());
      } else {
        cout << -1 << endl;
      }
    }
    while (bag0.size() < K && bag1.size()) {
      bag0.insert(*bag1.begin());
      bag1.erase(bag1.begin());
    }
    while (bag0.size() > K) {
      bag1.insert(*--bag0.end());
      bag0.erase(--bag0.end());
    }
  }

  return 0;
}