#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	ll q, k;
	cin >> q >> k;
	multiset<ll>m1, m2;
	for (ll i = 0; i < q; i++) {
		ll type;
		cin >> type;
		if (type == 1) {
			ll val;
			cin >> val;
			m1.insert(val);
			if (m1.size() > k) {
				ll val1 = *m1.rbegin();
				m1.erase(m1.find(val1));
				m2.insert(val);
			}
		} else {
			if (m1.size() != k)
				cout << "-1" << endl;
			else {
				ll val1 = *m1.rbegin();
				cout << val1 << endl;
				m1.erase(m1.find(val1));
				if (m2.size() >= 1) {
					ll val2 = *m2.begin();
					m2.erase(m2.find(val2));
					m1.insert(val2);
				}
			}
		}
	}
}