#include "bits/stdc++.h"

#define int long long

using namespace std;
using ll = long long;
using P = pair<ll, ll>;
const ll INF = (1LL << 61);
ll mod = 1000000007;
struct UnionFind {
	vector<int>par, vsize, esize;
	UnionFind(int sz_) : par(sz_), vsize(sz_, 1), esize(sz_, 0) {
		for (int i = 0; i < sz_; i++)par[i] = i;
	}
	void init(int sz_) {
		par.resize(sz_);
		vsize.resize(sz_, 1);
		esize.resize(sz_, 0);
		for (int i = 0; i < sz_; i++)par[i] = i;
	}
	int root(int x) {
		if (par[x] == x)return x;
		else return par[x] = root(par[x]);
	}
	bool merge(int x, int y) {
		x = root(x), y = root(y);
		if (x == y) {
			esize[x]++;
			return false;
		}
		if (vsize[x] < vsize[y])swap(x, y);
		vsize[x] += vsize[y];
		esize[x] += esize[y] + 1;
		par[y] = x;
		return true;
	}
	bool issame(int x, int y) {
		return root(x) == root(y);
	}
	int vs(int x) {
		return vsize[root(x)];
	}
	int es(int x) {
		return esize[root(x)];
	}
};

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int N; cin >> N;
	UnionFind uf(N);
	vector<int>A(N), B(N);
	for (int i = 0; i < N; i++) {
		int a, b; cin >> a >> b; a--; b--;
		uf.merge(a, b);
		A[i] = a + 1; B[i] = b + 1;
	}
	int cnt = 0;
	for (int i = 0; i < N; i++) {
		if (uf.root(i) == i)cnt += min(uf.vs(i), uf.es(i));
	}
	if (cnt != N) {
		cout << "No" << endl; return 0;
	}
	cout << "Yes" << endl;
	map<int, bool>mp;
	map<int, int>c;
	map<int, int>nowc;
	for (int i = 0; i < N; i++) {
		c[A[i]]++;
		c[B[i]]++;
		nowc[A[i]]++;
		nowc[B[i]]++;
	}
	for (int i = 0; i < N; i++) {
		if (c[A[i]] == 1) {
			cout << A[i] << endl;
			mp[A[i]] = true;
			nowc[A[i]]--;
		}
		else if(c[B[i]] == 1){
			cout << B[i] << endl;
			mp[B[i]] = true;
			nowc[B[i]]--;
		}
		
	}
	for (int i = 0; i < N; i++) {
		if (c[A[i]] == 1 || c[B[i]] == 1)continue;
		if (nowc[A[i]] == 1) {
			cout << A[i] << endl;
			mp[A[i]] = true;
			nowc[A[i]]--;
		}
		else if (nowc[B[i]] == 1) {
			cout << B[i] << endl;
			mp[B[i]] = true;
			nowc[B[i]]--;
		}
		else {
			if (mp[A[i]]) {
				cout << B[i] << endl;
				mp[B[i]] = true;
				nowc[B[i]]--;
			}
			else {
				cout << A[i] << endl;
				mp[A[i]] = true;
				nowc[A[i]]--;
			}
		}
	}
	return 0;

}