#include <bits/stdc++.h>
using namespace std;
#define rep(i, n)  for(long long i=0;i<(long long)(n);i++)
#define REP(i,k,n) for(long long i=k;i<(long long)(n);i++)
#define all(a) a.begin(),a.end()
#define pb emplace_back
#define eb emplace_back
#define lb(v,k) (lower_bound(all(v),k)-v.begin())
#define ub(v,k) (upper_bound(all(v),k)-v.begin())
#define fi first
#define se second
#define pi M_PI
#define PQ(T) priority_queue<T>
#define SPQ(T) priority_queue<T,vector<T>,greater<T>>
#define dame(a) {out(a);return 0;}
#define decimal cout<<fixed<<setprecision(15);
#define dupli(a) a.erase(unique(all(a)),a.end())
typedef long long ll;
typedef pair<ll,ll> P;
typedef tuple<ll,ll,ll> PP;
typedef tuple<ll,ll,ll,ll> PPP;
typedef multiset<ll> S;
using vi=vector<ll>;
using vvi=vector<vi>;
using vvvi=vector<vvi>;
using vp=vector<P>;
using vvp=vector<vp>;
using vb=vector<bool>;
using vvb=vector<vb>;
const ll inf=1001001001001001001;
const int INF=1001001001;
const int mod=1000000007;
const double eps=1e-10;
template<class T> bool chmin(T&a,T b){if(a>b){a=b;return true;}return false;}
template<class T> bool chmax(T&a,T b){if(a<b){a=b;return true;}return false;}
template<class T> void out(T a){cout<<a<<'\n';}
template<class T> void outp(T a){cout<<'('<<a.fi<<','<<a.se<<')'<<'\n';}
template<class T> void outvp(T v){rep(i,v.size())cout<<'('<<v[i].fi<<','<<v[i].se<<')';cout<<'\n';}
template<class T> void outvvp(T v){rep(i,v.size())outvp(v[i]);}
template<class T> void outv(T v){rep(i,v.size()){if(i)cout<<' ';cout<<v[i];}cout<<'\n';}
template<class T> void outvv(T v){rep(i,v.size())outv(v[i]);}
template<class T> bool isin(T x,T l,T r){return (l)<=(x)&&(x)<=(r);}
template<class T> void yesno(T b){if(b)out("yes");else out("no");}
template<class T> void YesNo(T b){if(b)out("Yes");else out("No");}
template<class T> void YESNO(T b){if(b)out("YES");else out("NO");}
template<class T> void noyes(T b){if(b)out("no");else out("yes");}
template<class T> void NoYes(T b){if(b)out("No");else out("Yes");}
template<class T> void NOYES(T b){if(b)out("NO");else out("YES");}
void outs(ll a,ll b){if(a>=inf-100)out(b);else out(a);}
ll gcd(ll a,ll b){if(b==0)return a;return gcd(b,a%b);}
ll modpow(ll a,ll b){a%=mod;if(b==0)return 1;if(b&1)return a*modpow(a,b-1)%mod;ll k=modpow(a,b/2);return k*k%mod;}

int main(){
    ll n;cin>>n;
    vvi g(n);
    rep(i,n-1){
        ll a,b;cin>>a>>b;a--;b--;
        g[a].pb(b);
        g[b].pb(a);
    }
    vi one;
    vi ans;
    rep(i,n){
        if(g[i].size()==1)continue;
        ll cnt=0;
        for(ll x:g[i])if(g[x].size()>1)cnt++;
        if(cnt==1)one.pb(i);
    }
    if(one.size()>2)dame(-1);
    if(!one.size()){
        vi ans;
        ans.pb(1);
        REP(j,3,n)ans.pb(j);
        ans.pb(2);ans.pb(n);
        outv(ans);
        return 0;
    }
    int i=one[1],p=-1;
    vi use;
    int sum=2;
    while(true){
        int ni=-1;
        use.pb(sum);
        if(i!=one[1])sum++;
        for(ll x:g[i])if(x!=p){
            if(g[x].size()==1)sum++;
            else ni=x;
        }
        if(ni==-1)break;
        p=i;i=ni;
    }
    ans.pb(1);
    rep(i,use.size()){
        if(i<use.size()-1)REP(j,use[i]+1,use[i+1])ans.pb(j);
        else REP(j,use[i]+1,n)ans.pb(j);
        ans.pb(use[i]);
    }
    ans.pb(n);
    i=one[0];p=-1;
    use=vi(0);
    sum=2;
    while(true){
        int ni=-1;
        use.pb(sum);
        if(i!=one[0])sum++;
        for(ll x:g[i])if(x!=p){
            if(g[x].size()==1)sum++;
            else ni=x;
        }
        if(ni==-1)break;
        p=i;i=ni;
    }
    vi ans2;
    ans2.pb(1);
    rep(i,use.size()){
        if(i<use.size()-1)REP(j,use[i]+1,use[i+1])ans2.pb(j);
        else REP(j,use[i]+1,n)ans2.pb(j);
        ans2.pb(use[i]);
    }
    ans2.pb(n);
    int w=0;
    vi ans3;
    rep(i,n){
        if(w==1)ans3.pb(ans[i]);
        else if(w==2)ans3.pb(ans2[i]);
        else if(ans[i]==ans2[i])ans3.pb(ans2[i]);
        else if(ans[i]>ans2[i]){
            w=2;ans3.pb(ans2[i]);
        }
        else{
            w=1;ans3.pb(ans[i]);
        }
    }
    outv(ans3);
}

Measured memory_bytes: 11508