2_C

#include <cmath>
#include <deque>
#include <iostream>
#include <vector>


using std::cin;
using std::cout;
using std::max;
using std::min;
using std::string;
using std::vector;
using std::deque;

int main() {
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);
  std::cout.tie(0);
  deque<int> qa;
  deque<int> qb;
  int qur;
  cin >> qur;
  int cnt1 = 0;
  int cnt2 = 0;
  int num = 0;
  for (int step = 0; step < qur; ++step) {
    char type;
    cin >> type;
    int nmb;
    if (type == '+') {
      cin >> nmb;
      if (cnt1 == num) {
        qa.push_back(qb.front());
        qb.pop_front();
        qb.push_back(nmb);
        cnt1++;
      } else {
        num++;
        cnt2++;
        qb.push_back(nmb);
      }
    } else if (type == '*') {
      cin >> nmb;
      if (cnt1 == num) {
        qa.push_back(nmb);
        cnt1++;
      } else {
        cnt2++;
        num++;
        qb.push_front(nmb);
      }
    } else {
      int res = qa.front();
      cout << res << "\n";
      if (cnt1 == num + 1) {
        cnt1--;
      } else {
        int go = qb.front();
        qa.push_back(go);
        qb.pop_front();
        num--;
        cnt2--;
      }
    }
  }
}