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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, prv;
    cin >> n;
    vector<int> idx(n, -1);
    vector<vector<int>> tb;
    int xp = -1, yp = -1;
    for(int i = 0; i < n; i++){
        int x, y;
        cin >> x >> y;
        if(xp != -1) idx[i] = idx[xp];
        if(x == 1) xp = i;
        else xp = -1;
        if(y == 2) yp = i;
        else if(y == 1) idx[i] = idx[yp];
        if(idx[i] == -1){
            idx[i] = tb.size();
            tb.emplace_back(vector<int>({}));
        }
        tb[idx[i]].emplace_back(i + 1);
    }
    for(auto &&vec : tb) reverse(vec.begin(), vec.end());
    sort(tb.begin(), tb.end());
    for(auto &&vec : tb) for(auto &&v : vec) cout << v << '\n';
}