#pragma GCC optimize ("O3")
#include <bits/stdc++.h>

using namespace std;
using ll = long long int;

#define all(v) (v).begin(),(v).end()
#define repeat(cnt,l) for(typename remove_const<typename remove_reference<decltype(l)>::type>::type cnt={};(cnt)<(l);++(cnt))
#define rrepeat(cnt,l) for(auto cnt=(l)-1;0<=(cnt);--(cnt))
#define iterate(cnt,b,e) for(auto cnt=(b);(cnt)!=(e);++(cnt))
#define diterate(cnt,b,e) for(auto cnt=(b);(cnt)!=(e);--(cnt))
const long long MD = 1000000007ll; const long double PI = 3.1415926535897932384626433832795L;
template<typename T1, typename T2> inline ostream& operator <<(ostream &o, const pair<T1, T2> p) { o << '(' << p.first << ':' << p.second << ')'; return o; }
template<typename T> inline T& chmax(T& to, const T& val) { return to = max(to, val); }
template<typename T> inline T& chmin(T& to, const T& val) { return to = min(to, val); }
void bye(string s, int code = 0) { cout << s << endl; exit(code); }
mt19937_64 randdev(8901016);
template<typename T, typename Random = decltype(randdev), typename enable_if<is_integral<T>::value>::type* = nullptr>
inline T rand(T l, T h, Random& rand = randdev) { return uniform_int_distribution<T>(l, h)(rand); }
template<typename T, typename Random = decltype(randdev), typename enable_if<is_floating_point<T>::value>::type* = nullptr>
inline T rand(T l, T h, Random& rand = randdev) { return uniform_real_distribution<T>(l, h)(rand); }template<typename T>
static ostream& operator<<(ostream& o, const std::vector<T>& v) {
  o << "[ "; for(const auto& e : v) o<<e<<' ';
  return o << ']';
}

template <typename I>
struct MyRangeFormat{ I b,e; MyRangeFormat(I _b, I _e):b(_b),e(_e){} };
template<typename I>
static ostream& operator<<(ostream& o, const MyRangeFormat<I>& f) {
  o << "[ "; iterate(i,f.b,f.e) o<<*i<<' ';
  return o << ']';
}
template <typename I>
struct MyMatrixFormat{
  const I& p; long long n, m;
  MyMatrixFormat(const I& _p, long long _n, long long _m):p(_p),n(_n),m(_m){}
};
template<typename I>
static ostream& operator<<(ostream& o, const MyMatrixFormat<I>& f) {
  o<<'\n';
  repeat(i,(f.n)) {
    repeat(j,f.m) o<<f.p[i][j]<<' ';
    o<<'\n';
  }
  return o;
}
struct LOG_t { ~LOG_t() { cout << endl; } };
#define LOG (LOG_t(),cout<<'L'<<__LINE__<<": ")
#define FMTA(m,w) (MyRangeFormat<decltype(m+0)>(m,m+w))
#define FMTR(b,e) (MyRangeFormat<decltype(e)>(b,e))
#define FMTV(v) FMTR(v.begin(),v.end())
#define FMTM(m,h,w) (MyMatrixFormat<decltype(m+0)>(m,h,w))

#if defined(_WIN32) || defined(_WIN64)
#define getc_x _getc_nolock
#define putc_x _putc_nolock
#elif defined(__GNUC__)
#define getc_x getc_unlocked
#define putc_x putc_unlocked
#else
#define getc_x getc
#define putc_x putc
#endif
class MaiScanner {
  FILE* fp_;
  constexpr bool isvisiblechar(char c) noexcept { return (0x21<=(c)&&(c)<=0x7E); }
public:
  inline MaiScanner(FILE* fp):fp_(fp){}
  template<typename T> void input_integer(T& var) noexcept {
    var = 0; T sign = 1;
    int cc = getc_x(fp_);
    for (; cc < '0' || '9' < cc; cc = getc_x(fp_))
      if (cc == '-') sign = -1;
    for (; '0' <= cc && cc <= '9'; cc = getc_x(fp_))
      var = (var << 3) + (var << 1) + cc - '0';
    var = var * sign;
  }
  inline int c() noexcept { return getc_x(fp_); }
  template<typename T, typename enable_if<is_integral<T>::value, nullptr_t>::type = nullptr>
  inline MaiScanner& operator>>(T& var) noexcept { input_integer<T>(var); return *this; }
  inline MaiScanner& operator>>(string& var) {
    int cc = getc_x(fp_);
    for (; !isvisiblechar(cc); cc = getc_x(fp_));
    for (; isvisiblechar(cc); cc = getc_x(fp_))
      var.push_back(cc);
    return *this;
  }
  template<typename IT> inline void in(IT begin, IT end) { for (auto it = begin; it != end; ++it) *this >> *it; }
};
class MaiPrinter {
  FILE* fp_;
public:
  inline MaiPrinter(FILE* fp):fp_(fp){}
  template<typename T>
  void output_integer(T var) noexcept {
    if (var == 0) { putc_x('0', fp_); return; }
    if (var < 0)
      putc_x('-', fp_),
      var = -var;
    char stack[32]; int stack_p = 0;
    while (var)
      stack[stack_p++] = '0' + (var % 10),
      var /= 10;
    while (stack_p)
      putc_x(stack[--stack_p], fp_);
  }
  inline MaiPrinter& operator<<(char c) noexcept { putc_x(c, fp_); return *this; }
  template<typename T, typename enable_if<is_integral<T>::value, nullptr_t>::type = nullptr>
  inline MaiPrinter& operator<<(T var) noexcept { output_integer<T>(var); return *this; }
  inline MaiPrinter& operator<<(char* str_p) noexcept { while (*str_p) putc_x(*(str_p++), fp_); return *this; }
  inline MaiPrinter& operator<<(const string& str) {
    const char* p = str.c_str();
    const char* l = p + str.size();
    while (p < l) putc_x(*p++, fp_);
    return *this;
  }
  template<typename IT> void join(IT begin, IT end, char sep = ' ') { for (bool b = 0; begin != end; ++begin, b = 1) b ? *this << sep << *begin : *this << *begin; }
};
MaiScanner scanner(stdin);
MaiPrinter printer(stdout);

class GraphE {
 public:
  using W_T = int;
  struct Edge {
    int u, v;
    W_T value;
    Edge(int from = 0, int to = 0, W_T value = 0) : u(from), v(to), value(value) {}
    inline int to(int _v) const { return _v == v ? u : v; }
  };
  size_t n;
  vector<vector<int>> vertex_to;
  vector<Edge> edges;

  explicit GraphE(int n = 1) : n(n), vertex_to(n) {}

  inline size_t size() const noexcept { return n; }
  void resize(size_t _n) { vertex_to.resize(n = _n); }
  void connect(int from, int to, W_T val = 0) {
    vertex_to[(size_t)from].push_back((int)edges.size());
    vertex_to[(size_t)to].push_back((int)edges.size());
    edges.emplace_back(from, to, val);
  }
  void connect(vector<Edge>&& es) {
    edges = move(es);
    for (int i = 0; (size_t)i < edges.size(); ++i) {
      vertex_to[edges[i].u].push_back(i);
      vertex_to[edges[i].v].push_back(i);
    }
  }
};

//

int N;
GraphE graph;

//
map<pair<int, int>, vector<pair<int, int>>> edges; // [(u,v)] = [](index, select)

bool painted[100010];  // unused
void update(int u, int v, int p){
  // LOG << u << "<->" << v <<" : " << p;
  if (u > v) swap(u, v);
  for (auto& vv : edges[make_pair(u,v)]) {
    if (vv.second == -1) {
      vv.second = p;
      break;
    }
  }
  painted[p] = true;
}

bool vis1[100010];
int dfs(int i, vector<int>& g){
  int a = 0;
  g.push_back(i);
  vis1[i] = true;
  for (auto ei : graph.vertex_to[i]) {
    auto to = graph.edges[ei].to(i);
    if (vis1[to]) continue;
    a += dfs(to, g);
  }
  return a + 1;
}

void greedy(int i) {
  pair<int, int> best{MD, -9};
  for (auto ei : graph.vertex_to[i]) {
    auto& e = graph.edges[ei];
    auto to = e.to(i);
    if (!e.value) {
      if (painted[to]) {
        e.value = true;
        update(i, to, i);
        return;
      }
      chmin(best, pair<int,int>{graph.vertex_to[to].size(), ei});
    }
  }
  auto& e = graph.edges[best.second];
  e.value = true;
  update(i, e.to(i), i);
}

// bool vis2[100010];
// void paint(int i) {
//   LOG << i;
//   vis2[i] = true;
//   for (auto ei : graph.vertex_to[i]) {
//     auto& e = graph.edges[ei];
//     auto to = e.to(i);
//     if (!e.value) {
//       LOG << e.u << ' ' << e.v << " - " << i << ' ' << to;
//       e.value = true;
//       if (!painted[i]) {
//         update(i, to, i);
//       } else if (!painted[to]) {
//         update(i, to, to);
//       } else {
//         LOG << FMTA(painted, N);
//         LOG << "?";
//       }
//       paint(to);
//     }
//   }
//   return;
  
// }

int main() {
  scanner >> N;
  graph.resize(N);
  repeat(i, N) {
    int a, b;
    scanner >> a >> b;
    --a; --b;
    if (a > b) swap(a, b);
    graph.connect(a, b);
    edges[make_pair(a,b)].push_back(make_pair(i, -1));
  }
  
  repeat(i, N) {
    if (vis1[i]) {
      if (!painted[i]) cerr << "!!!";
      continue;
    }
    vector<int> group;
    int n = dfs(i, group);
    int m = 0;
    priority_queue<pair<int, int>> vq;
    for (auto v : group) {
      int s = graph.vertex_to[v].size();
      m += s;
      vq.emplace(-s, v);
    }
    m /= 2;
    if (n != m) {
      bye("No");
    }
    while (!vq.empty()) {
      auto p = vq.top(); vq.pop();
      greedy(p.second);
    }
  }
  
  vector<int> sel(N);
  
  for (auto& kv : edges) {
    for (auto p : kv.second) {
      sel[p.first] = p.second + 1;
    }
  }
  
  printer << "Yes\n";
  printer.join(all(sel), '\n');
  
  return 0;
}