#include <bits/stdc++.h>
using namespace std;

using ll = int64_t;
using ull = uint64_t;
using vi = vector<int>;
using vc = vector<char>;
using vs = vector<string>;
using vd = vector<double>;
using vll = vector<ll>;
using vb = vector<bool>;
using pii = pair<int,int>;
using psi = pair<string,int>;
using pis = pair<int,string>;
using pci = pair<char,int>;
using tiii = tuple<int,int,int>;
using mii = map<int,int>;
using mis = map<int,string>;
using msi = map<string,int>;
using mci = map<char,int>;
using si = set<int>;
using ss = set<string>;
using sc = set<char>;
using sll = set<ll>;
using spii = set<pii>;
using qi = queue<int>;
using vvc = vector<vc>;
using vvi = vector<vi>;
using vvb = vector<vb>;
using vvs = vector<vs>;
using vvll = vector<vll>;
using vpii = vector<pii>;
using vpci = vector<pci>;
using mivi = map<int,vi>;
using mivs = map<int,vs>;
using misi = map<int,si>;

int main() {
  int N,count = 0;
  cin >> N;
  vi A(N),B(N),result;
  mii final,ravel;
  for (int i = 0; i < N; i++) {
    cin >> A[i] >> B[i];
  }
  //ラベル張り
  qi B_2;
  for (int i = 0; i < N; i++) {
    if (A[i] == 1) {
      ravel[i + 1] = i;
    }
    if (B[i] == 2) {
      B_2.push(i);
    }
    else if (B[i] == 1) {
      ravel[i] = B_2.front();
      B_2.pop();
    }
  }
  //実行
  for (int i = 0; i < N; i++) {
    if (A[i] == 0 && B[i] == 0) {
      int now = i;
      result.push_back(now);
      while(ravel.count(now)) {
        int next = ravel.at(now);
        result.push_back(next);
        now = next;
      }
    }
    else if (A[i] == 0 && B[i] == 1) {
      int now = i;
      result.push_back(now);
      while(ravel.count(now)) {
        int next = ravel.at(now);
        result.push_back(next);
        now = next;
      }
    }
  }
  //出力
  for (int i = 0; i < N; i++) {
    cout << result[i] + 1 << endl;
  }
}