#include <bits/stdc++.h>
using namespace std;
int main(){
	ios::sync_with_stdio(false);
	priority_queue<int,vector<int>,greater<int> > q;
	int n,k;
	char a;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>a;
		if(a=='i')
		{
			cin>>k;
			q.push(k);
		}
		if(a=='q')
		{
			cout<<q.top() <<endl;
			q.pop() ;
		}
	}
	return 0;
}

/**************************************************************
	Problem: 1753
	User: admin
	Language: C++
	Result: Accepted
	Time:4 ms
	Memory:2232 kb
****************************************************************/