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

using ll = long long;

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  
  int q, k;
  cin >> q >> k;
  
  multiset<ll> ms;
  auto it = ms.begin();
  for (int i = 0; i < q; i++) {
    int x;
    cin >> x;
    if (x == 1) {
      ll v;
      cin >> v;
      ms.insert(v);
      if (ms.size() == k && it != ms.begin()) {
        it = ms.end();
        it--;
      }
      else if (ms.size() > k && *it > v) {
        it--;
      }
    }
    else {
      if (ms.size() < k) {
        cout << "-1\n";
      }
      else {
        cout << *it << '\n';
        it = ms.erase(it);
      }
    }
  }
}