#line 1 "e.cpp"
#pragma region Macros
#include <bits/stdc++.h>
using namespace std;
template <class T> inline bool chmax(T &a, T b) {
    if(a < b) {
        a = b;
        return 1;
    }
    return 0;
}
template <class T> inline bool chmin(T &a, T b) {
    if(a > b) {
        a = b;
        return 1;
    }
    return 0;
}
#ifdef DEBUG
template <class T, class U>
ostream &operator<<(ostream &os, const pair<T, U> &p) {
    os << '(' << p.first << ',' << p.second << ')';
    return os;
}
template <class T> ostream &operator<<(ostream &os, const vector<T> &v) {
    os << '{';
    for(int i = 0; i < (int)v.size(); i++) {
        if(i) { os << ','; }
        os << v[i];
    }
    os << '}';
    return os;
}
void debugg() { cerr << endl; }
template <class T, class... Args>
void debugg(const T &x, const Args &... args) {
    cerr << " " << x;
    debugg(args...);
}
#define debug(...)                                                             \
    cerr << __LINE__ << " [" << #__VA_ARGS__ << "]: ", debugg(__VA_ARGS__)
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif

struct Setup {
    Setup() {
        cin.tie(0);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(15);
    }
} __Setup;

using ll = long long;
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
#define FOR(i, a, b) for(int i = (a); i < int(b); i++)
#define REP(i, n) FOR(i, 0, n)
const int INF = 1 << 30;
const ll LLINF = 1LL << 60;
constexpr int MOD = 1000000007;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

void Case(int i) { cout << "Case #" << i << ": "; }
int popcount(int x) { return __builtin_popcount(x); }
ll popcount(ll x) { return __builtin_popcountll(x); }
#pragma endregion Macros

#line 1 "/home/siro53/kyo-pro/compro_library/graph/bipartite_matching.hpp"
struct BipartiteMatching {
    int L, R;
    vector<int> l, r, d;
    vector<bool> seen;
    vector<vector<int>> G;

    BipartiteMatching(int L, int R)
        : L(L), R(R), l(L, -1), r(R, -1), d(L), seen(L), G(L) {}

    void add_edge(int _l, int _r) { G[_l].emplace_back(_r); }

    void bfs() {
        vector<int> que;
        int head = 0, tail = 0;
        fill(d.begin(), d.end(), -1);
        for(int i = 0; i < L; i++) {
            if(l[i] == -1) {
                que.emplace_back(i), tail++;
                d[i] = 0;
            }
        }
        while(head != tail) {
            int v = que[head++];
            for(const auto &u : G[v]) {
                if(r[u] != -1 && d[r[u]] == -1) {
                    d[r[u]] = d[v] + 1;
                    que.emplace_back(r[u]), tail++;
                }
            }
        }
    }

    bool dfs(int v) {
        if(seen[v]) return false;
        seen[v] = true;
        for(const auto &u : G[v]) {
            if(r[u] == -1 || (d[r[u]] == d[v] + 1 && dfs(r[u]))) {
                l[v] = u;
                r[u] = v;
                return true;
            }
        }
        return false;
    }

    int matching() {
        int res = 0;
        while(1) {
            bfs();
            fill(seen.begin(), seen.end(), false);
            int f = 0;
            for(int i = 0; i < L; i++) {
                if(l[i] == -1 && dfs(i)) f++;
            }
            if(f == 0) return res;
            res += f;
        }
    }
};
#line 72 "e.cpp"

int N;
int a[100100], b[100100];

int main() {
    cin >> N;
    BipartiteMatching bm(N, N);
    REP(i, N) {
        cin >> a[i] >> b[i];
        a[i]--; b[i]--;
        bm.add_edge(i, a[i]);
        if(a[i] != b[i]) bm.add_edge(i, b[i]);
    }
    int ans = bm.matching();
    if(ans < N) {
        cout << "No\n";
        return 0;
    }
    cout << "Yes\n";
    REP(i, N) cout << bm.l[i]+1 << endl;
}