#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<numeric>
#include<cmath>
#include<utility>
#include<tuple>
#include<cstdint>
#include<cstdio>
#include<iomanip>
#include<map>
#include<queue>
#include<set>
#include<stack>
#include<deque>
#include<unordered_map>
#include<unordered_set>
#include<bitset>
#include<cctype>
#include<chrono>
#include<random>
#include<cassert>
#include<cstddef>
#include<iterator>
#include<string_view>
#include<type_traits>

#ifdef LOCAL
#  include "debug_print.hpp"
#  define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define debug(...) (static_cast<void>(0))
#endif

using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
#define rrep(i,n) for(int i=(n)-1; i>=0; i--)
#define FOR(i,a,b) for(int i=(a); i<(b); i++)
#define RFOR(i,a,b) for(int i=(b-1); i>=(a); i--)
#define ALL(v) v.begin(), v.end()
#define RALL(v) v.rbegin(), v.rend()
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );
#define pb push_back
using ll = long long;
using D = double;
using LD = long double;
using P = pair<int, int>;
template<typename T> using PQ = priority_queue<T,vector<T>>;
template<typename T> using minPQ = priority_queue<T, vector<T>, greater<T>>;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
void yesno(bool flag) {cout << (flag?"Yes":"No") << "\n";}

template<typename T, typename U>
ostream &operator<<(ostream &os, const pair<T, U> &p) {
    os << p.first << " " << p.second;
    return os;
}
template<typename T, typename U>
istream &operator>>(istream &is, pair<T, U> &p) {
    is >> p.first >> p.second;
    return is;
}

template<typename T>
ostream &operator<<(ostream &os, const vector<T> &v) {
    int s = (int)v.size();
    for (int i = 0; i < s; i++) os << (i ? " " : "") << v[i];
    return os;
}
template<typename T>
istream &operator>>(istream &is, vector<T> &v) {
    for (auto &x : v) is >> x;
    return is;
}
void in() {}
template<typename T, class... U>
void in(T &t, U &...u) {
    cin >> t;
    in(u...);
}
void out() { cout << "\n"; }
template<typename T, class... U, char sep = ' '>
void out(const T &t, const U &...u) {
    cout << t;
    if (sizeof...(u)) cout << sep;
    out(u...);
}
void outr() {}
template<typename T, class... U, char sep = ' '>
void outr(const T &t, const U &...u) {
    cout << t;
    outr(u...);
}

#include "atcoder/dsu.hpp"

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n; in(n);
    vector<vector<P>> g(n);
    vector<int> prev(n,-1);
    vector<int> ans(n);

    auto get_path = [&] (int u, int v) -> vector<int> {
        vector<int> res = {v};
        queue<int> q;
        q.push(u);
        while(q.size()){
            int x = q.front(); q.pop();
            for(auto [y,idx] : g[x]){
                if(prev[y] == -1){
                    ans[idx] = y+1;
                    prev[y] = x;
                    q.push(y);
                }
            }
        }
        int now = v;
        while(now != u){
            now = prev[now];
            res.pb(now);
        }
        return res;
    };

    atcoder::dsu d(n);
    vector<bool> loop(n,false);
    vector<bool> seen(n,false);

    rep(i,n){
        int a,b; in(a,b); a--; b--;
        if(a == b){
            int u = d.leader(a);
            if(loop[u]){
                out("No");
                return 0;
            }
            else{
                loop[u] = true;
                seen[a] = true;
                ans[i] = a+1;
            }
        }
        else if(d.same(a,b)){
            int u = d.leader(a);
            if(loop[u]){
                out("No");
                return 0;
            }
            else{
                loop[u] = true;
                auto vp = get_path(a,b);
                for(int v : vp) seen[v] = true;
                ans[i] = b+1;
            }
        }
        else{
            int u = d.leader(a);
            int v = d.leader(b);
            if(loop[u]&loop[v]){
                out("No");
                return 0;
            }
            int w = d.merge(a,b);
            loop[w] = loop[u] | loop[v];
            g[a].pb({b,i});
            g[b].pb({a,i});
        }
    }

    queue<int> q;
    rep(i,n){
        if(seen[i]) q.push(i);
    }
    while(q.size()){
        int x = q.front(); q.pop();
        for(auto [y,idx] : g[x]){
            if(seen[y]) continue;
            seen[y] = true;
            ans[idx] = y+1;
            q.push(y);
        }
    }
    out("Yes");
    rep(i,n) out(ans[i]);
}