//#include <atcoder/all>
#include <bits/stdc++.h>
#include <cmath>
using namespace std;
//using namespace atcoder;
using ll = long long;
#define all(A) A.begin(),A.end()
using vll = vector<ll>;
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
using Graph = vector<vector<ll>>;
Graph G;
vll E;
vector<bool> seen;

int main() {

	ll N;
	cin >> N;
	Graph G(N);
	vector<tuple<ll, ll, ll>> edge(N);
	vll E(N, 0);
	vector<multiset<ll>> SE(N);
	map<pair<ll, ll>, queue<ll>> M;
	rep(i, N) {
		ll A, B;
		cin >> A >> B;
		A--; B--;
		edge[i] = make_tuple(A, B, -1);
		M[make_pair(min(A, B), max(A, B))].push(i);
		SE[A].insert(B);
		SE[B].insert(A);
	}
	queue<ll> Q;
	rep(i, N) {
		if (SE[i].size() == 1) {
			Q.push(i);
		}
		else if (SE[i].size() == 0) {
			cout << "No" << endl;
			return 0;
		}
	}
	ll k = 0;
	ll j = 0;
	vector<bool> USE(N,false);
	while (1) {
		while (!Q.empty()) {
			auto p = Q.front();
			USE[p]=true;
			Q.pop();
			ll n = *SE[p].begin();
			ll m = M[make_pair(min(p, n), max(p, n))].front();
			M[make_pair(min(p, n), max(p, n))].pop();
			edge[m] = make_tuple(p, n, p);
			k++;
			SE[p].erase(SE[p].find(n));
			SE[n].erase(SE[n].find(p));
			if(k!=N&&SE[n].size()==0&&USE[n]==false){
				cout<<"No"<<endl;
				return 0;
			}
			if (SE[n].size() == 1) {
				Q.push(n);
			}

		}
		if (k == N) {
			cout << "Yes" << endl;
			rep(i, N) {
				cout << 1+get<2>(edge[i]) << endl;
			}
			return 0;
		}
		while (SE[j].size() == 0||USE[j]) {
			j++;
		}
		ll p = j;
		USE[p]=true;
		ll n = *SE[p].begin();
		ll m = M[make_pair(min(p, n), max(p, n))].front();
		M[make_pair(min(p, n), max(p, n))].pop();
		edge[m] = make_tuple(p, n, p);
		k++;
		SE[p].erase(SE[p].find(n));
		SE[n].erase(SE[n].find(p));
		if (SE[n].size() == 1) {
			Q.push(n);
		}

	}
}