#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;
using ull = unsigned long long;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	ll q, k;
	cin >> q >> k;
	priority_queue<ll> ql;
	priority_queue<ll, vector<ll>, greater<ll> > qr;
	stringstream ss;
	for (ll i = 0; i < q; ++i)
	{
		int t;
		cin >> t;

		if (t == 1)
		{
			ll v;
			cin >> v;

			if ((int)ql.size() < k)
				ql.push(v);
			else
			{
				ll qlt = ql.top();
				if (qlt > v)
				{
					ql.pop();
					ql.push(v);
					qr.push(qlt);
				}
				else
					qr.push(v);
			}
		}
		else
		{
			if ((int)ql.size() >= k)
			{
				ss << ql.top() << "\n";
				ql.pop();
				if (!qr.empty())
				{
					ql.push(qr.top());
					qr.pop();
				}
			}
			else
				ss << "-1\n";

		}
	}

	cout << ss.str();

	return 0;
}