#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
int q, k;
priority_queue<ll, vector<ll>, greater<ll>> minq;
priority_queue<ll> maxq;

void f1() {
  ll v;
  scanf("%lld", &v);

  if (maxq.size() < k) {
    maxq.push(v);
  } else {
    if (maxq.top() > v) {
      ll tmp = maxq.top(); maxq.pop();
      maxq.push(v);
      v = tmp;
    }
    minq.push(v);
  }
}

void f2() {
  if (maxq.size() < k) {
    puts("-1");
  } else {
    cout << maxq.top() << endl;
    maxq.pop();
    if (minq.size() > 0) {
      maxq.push(minq.top()); minq.pop();
    }
  }
}

int main() {
  scanf("%d %d", &q, &k);

  while (q--) {
    int query;
    scanf("%d", &query);
    if (query == 1) f1();
    else f2();
  }
  return 0;
}