#include <algorithm>
#include <atcoder/internal_queue>
#include <cassert>
#include <limits>
#include <queue>
#include <vector>
#include <time.h>
#include <chrono>
#include <sys/time.h>
#include <iostream>
using namespace std;
using namespace atcoder;
#define ll long long
#define INF 1000000000000000000
//namespace atcoder {

vector<ll> ans(200010,-1);

    struct _edge {
        int to, rev;
        ll cap;
        int index;
    };

template <class Cap> struct mf_graph {
  public:
    mf_graph() : _n(0) {}
    mf_graph(int n) : _n(n), g(n) {}

    int add_edge(int from, int to, Cap cap,int index) {
        assert(0 <= from && from < _n);
        assert(0 <= to && to < _n);
        assert(0 <= cap);
        int m = int(pos.size());
        pos.push_back({from, int(g[from].size())});
        int from_id = int(g[from].size());
        int to_id = int(g[to].size());
        if (from == to) to_id++;
        g[from].push_back(_edge{to, to_id, cap, index});
        g[to].push_back(_edge{from, from_id, 0, index});
        return m;
    }

    struct edge {
        int from, to;
        Cap cap, flow;
    };

    edge get_edge(int i) {
        int m = int(pos.size());
        assert(0 <= i && i < m);
        auto _e = g[pos[i].first][pos[i].second];
        auto _re = g[_e.to][_e.rev];
        return edge{pos[i].first, _e.to, _e.cap + _re.cap, _re.cap};
    }

    Cap flow(int s, int t) {
        return flow(s, t, std::numeric_limits<Cap>::max());
    }
    Cap flow(int s, int t, Cap flow_limit) {
        assert(0 <= s && s < _n);
        assert(0 <= t && t < _n);
        assert(s != t);

        std::vector<int> level(_n), iter(_n);
        internal::simple_queue<int> que;

        auto bfs = [&]() {
            std::fill(level.begin(), level.end(), -1);
            level[s] = 0;
            que.clear();
            que.push(s);
            while (!que.empty()) {
                int v = que.front();
                que.pop();
                for (auto e : g[v]) {
                    if (e.cap == 0 || level[e.to] >= 0) continue;
                    level[e.to] = level[v] + 1;
                    if (e.to == t) return;
                    que.push(e.to);
                }
            }
        };
        auto dfs = [&](auto self, int v, Cap up) {
            if (v == s) return up;
            Cap res = 0;
            int level_v = level[v];
            for (int& i = iter[v]; i < int(g[v].size()); i++) {
                _edge& e = g[v][i];
                if (level_v <= level[e.to] || g[e.to][e.rev].cap == 0) continue;
                Cap d =
                    self(self, e.to, std::min(up - res, g[e.to][e.rev].cap));
                if (d <= 0) continue;
                g[v][i].cap += d;
                g[e.to][e.rev].cap -= d;
                res += d;
                if (res == up) break;
            }
            return res;
        };

        Cap flow = 0;
        while (flow < flow_limit) {
            bfs();
            if (level[t] == -1) break;
            std::fill(iter.begin(), iter.end(), 0);
            while (flow < flow_limit) {
                Cap f = dfs(dfs, t, flow_limit - flow);
                if (!f) break;
                flow += f;
            }
        }
        return flow;
    }
    int _n;

    std::vector<std::pair<int, int>> pos;
    std::vector<std::vector<_edge>> g;    
};

//}  // namespace atcoder

int main(){
  ll N,A,B;
  cin>>N;
  mf_graph<ll> F(2*N+2);
  for(int i=0;i<N;i++){
    cin>>A>>B;
    A--;B--;
    F.add_edge(2*N,i,1,-1);
    F.add_edge(i,N+A,1,i);
    if(A!=B)F.add_edge(i,N+B,1,i);
    F.add_edge(N+i,2*N+1,1,-1);
  }
  ll cnt=F.flow(2*N,2*N+1);
  if(cnt!=N){
    cout<<"No\n";
    return 0;
  }
  cout<<"Yes\n";
  for(int i=N;i<2*N;i++){
    ll s=F.g.at(i).size();
    for(int j=0;j<s;j++){
      if(F.g.at(i).at(j).cap!=0){
        ans.at(F.g.at(i).at(j).to)=i-N+1;
      }
    }
  }
  for(int i=0;i<N;i++){
    cout<<ans.at(i)<<endl;
  }
  return 0;
}