#include <iostream>
#include <vector>
#include <utility>
#include <atcoder/maxflow>
using namespace std;
using i32 = int32_t;
using i64 = int64_t;
#define rep(i,n) for(int i=0; i<(n); i++)


int N;
vector<int> A,B;
vector<int> AI,BI;


int main(){
  cin >> N;
  A.resize(N);
  B.resize(N);
  rep(i,N){ cin >> A[i] >> B[i]; A[i]--; B[i]--; }
  AI.resize(N);
  BI.resize(N);

  atcoder::mf_graph<int> G(N*2+2);
  rep(i,N){
    G.add_edge(N*2,i,1);
    AI[i] = G.add_edge(i,N+A[i],1);
    BI[i] = G.add_edge(i,N+B[i],1);
    G.add_edge(N+i,N*2+1,1);
  }
  int f = G.flow(N*2,N*2+1);

  if(f != N){ cout << "No\n"; return 0; }

  cout << "Yes\n";

  rep(i,N){
    auto eA = G.get_edge(AI[i]);
    if(eA.flow == 1) cout << (A[i]+1) << "\n";
    else cout << (B[i]+1) << "\n";
  }
  return 0;
}




struct ios_do_not_sync{
  ios_do_not_sync(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
  }
} ios_do_not_sync_instance;