#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001LL

int main() {
	
	int n;
	cin>>n;
	
	vector<int> a(n),b(n);
	vector<vector<int>> E(n);
	vector<int> d(n);
	rep(i,n){
		cin>>a[i]>>b[i];
		if(a[i]==1){
			d[i]++;
			E[i+1].push_back(i);
		}
	}
	int last =-1;
	for(int i=n-1;i>=0;i--){
		if(b[i]==2){
			d[i]++;
			E[last].push_back(i);
		}
		if(b[i]==1)last = i;
	}
	vector<int> ans;
	priority_queue<int,vector<int>,greater<int>> q;
	rep(i,n){
		if(d[i]==0)q.push(i);
	}
	while(q.size()>0){
		int u = q.top();
		q.pop();
		cout<<u+1<<endl;
		rep(i,E[u].size()){
			int v = E[u][i];
			d[v]--;
			if(d[v]==0){
				q.push(v);
			}
		}
	}
}