#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=(n)-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define vtpl(x,y,z) vector<tuple<x,y,z>>
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=1e9+10;
const ll INF=4e18;
const ll dy[9]={0,1,-1,0,1,1,-1,-1,0};
const ll dx[9]={1,0,0,-1,1,-1,1,-1,0};
template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
ll n;

int main(){
    cin >> n;
    vl ans(n,-1);
    vl a(n),b(n);
    rep(i,n){
        cin >> a[i] >> b[i];a[i]--;b[i]--;
    }
    //set<ll> rem;rep(i,n)rem.insert(i);
    vector<multiset<ll>> deg(n);
    rep(i,n){
        deg[a[i]].insert(i);
        deg[b[i]].insert(i);
    }
    priority_queue<pl,vpl,greater<pl>> que;
    rep(i,n)que.push({deg[i].size(),i});
    vector<ll> comp(n);
    while(!que.empty()){
        auto [hoge,num]=que.top();que.pop();
        if(comp[num]||hoge==0)continue;
        comp[num]=1;
        ll edge=*deg[num].begin();
        ans[edge]=num;
        deg[a[edge]].erase(deg[a[edge]].find(edge));
        deg[b[edge]].erase(deg[b[edge]].find(edge));
        que.push({deg[a[edge]].size(),a[edge]});
        que.push({deg[b[edge]].size(),b[edge]});
    }
    bool ok=true;rep(i,n)if(ans[i]==-1)ok=false;
    cout << (ok? "Yes":"No") <<endl;
    if(ok)rep(i,n)cout << ans[i]+1 <<endl;
    //rep(i,n)cout << ans[i] <<endl;
}