#include <bits/stdc++.h>
#include <atcoder/all>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/cpp_int.hpp>
namespace mp = boost::multiprecision;
using Bint = mp::cpp_int;
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n;
    cin >> n;
    vector<int> a(n), b(n);
    rep(i,n) cin >> a[i] >> b[i];
    vector<int> vs;
    vector<int> ans;
    int g = -1;
    vector<int> rev(n, -1);
    rep(i,n) {
        if(a[i]==1) {
            rev[i+1] = i;
        }
        if(b[i]==2) g = i;
        if(b[i]==1) rev[i] = g;
    }
    rep(i,n) {
        if(a[i]==0 && b[i]!=2) {
            ans.push_back(i);
            int x = i;
            while(rev[x]!=-1) {
                ans.push_back(rev[x]);
                x = rev[x];
            }
        }
    }
    rep(i,n) {
        cout << 1+ans[i] << endl;
    }
    return 0;
}