#include <bits/stdc++.h>
using namespace std;
int main(){
	int N;
	cin >> N;
	vector<int> A(N), B(N);
	for (int i = 0; i < N; i++){
		cin >> A[i] >> B[i];
	}
	vector<int> G(N, -1);
	int k = 0;
	for (int i = 0; i < N; i++){
		if (A[i] == 1){
			G[i + 1] = i;
		}
		if (B[i] == 2){
			k = i;
		}
		if (B[i] == 1){
			G[i] = k;
		}
		if (A[i] == 0 and B[i] != 2){
			int now = i;
			while (true){
				cout << now + 1 << endl;
				now = G[now];
				if (now == -1){
					break;
				}
			}
		}
	}
}