#include<bits/stdc++.h>
using namespace std;
#pragma region Macros
#define ll long long
#define ld long double
#define FOR(i,l,r) for(ll i=(l);i<(r);++i)
#define REP(i,n) FOR(i,0,n)
#define REPS(i,n) FOR(i,1,n+1)
#define RFOR(i,l,r) for(ll i=(l);i>=(r);--i)
#define RREP(i,n) RFOR(i,n-1,0)
#define RREPS(i,n) RFOR(i,n,1)
#define pb push_back
#define eb emplace_back
#define SZ(x) ((ll)(x).size())
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
template<class T = ll> using V = vector<T>;
template<class T = ll> using VV = V<V<T>>;
using P = pair<ll, ll>;
#define VEC(type, name, size)\
    V<type> name(size);\
    IN(name)
#define VVEC(type, name, h, w)\
    VV<type> name(h, V<type>(w));\
    IN(name)
#define INT(...)\
    int __VA_ARGS__;\
    IN(__VA_ARGS__)
#define LL(...)\
    ll __VA_ARGS__;\
    IN(__VA_ARGS__)
#define STR(...)\
    string __VA_ARGS__;\
    IN(__VA_ARGS__)
#define CHAR(...)\
    char __VA_ARGS__;\
    IN(__VA_ARGS__)
#define DOUBLE(...)\
    DOUBLE __VA_ARGS__;\
    IN(__VA_ARGS__)
#define LD(...)\
    LD __VA_ARGS__;\
    IN(__VA_ARGS__)
template <class T> void scan(T a) { cin >> a; }
void scan(int &a) { cin >> a; }
void scan(long long &a) { cin >> a; }
void scan(char &a) { cin >> a; }
void scan(double &a) { cin >> a; }
void scan(long double &a) { cin >> a; }
void scan(char a[]) { scanf("%s", a); }
void scan(string &a) { cin >> a; }
template <class T> void scan(V<T> &);
template <class T, class L> void scan(pair<T, L> &);
template <class T> void scan(V<T> &a) { for(auto &i : a) scan(i); }
template <class T, class L> void scan(pair<T, L> &p){ scan(p.first); scan(p.second); }
template <class T> void scan(T &a) { cin >> a; }
void IN() {}
template <class Head, class... Tail> void IN(Head &head, Tail &... tail) { scan(head); IN(tail...); }
template <class T> inline void print(T x){ cout << x << '\n';}
struct inputoutputfaster{
    inputoutputfaster(){
        ios::sync_with_stdio(false);\
        cin.tie(nullptr);
        cout << fixed << setprecision(15);
    }
}inputoutputfaster_;
template <class T> V<T> press(V<T> &x){ 
    V<T> res = x;
    sort(all(res));
    res.erase(unique(all(res)), res.end());
    REP(i, SZ(x)){
        x[i] = lower_bound(all(res), x[i]) - res.begin();
    }
    return res;
}
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; }
inline void Yes(bool b = true) {cout << (b ? "Yes" : "No") << '\n';}
inline void YES(bool b = true) {cout << (b ? "YES" : "NO") << '\n';}
inline void err(bool b = true) {if(b) {cout << -1 << '\n'; exit(0);}}
template<class T> inline void fin(bool b = true, T e = 0) {if(b) {cout << e << '\n'; exit(0);}}
template<class T> T divup(T x, T y) {return (x+(y-1))/y;}
template <typename T> T pow(T a, long long n, T e = 1) {T ret = e; while (n) {if (n & 1) ret *= a; a *= a; n >>= 1; } return ret; }
const ll INF = 1e18;
#pragma endregion

// Graph Template
struct Edge{
    ll to,cost;
    Edge(ll to,ll cost):to(to),cost(cost){}
    bool operator < (const Edge& a) const{
        return cost < a.cost;
    }
};
using Graph = VV<>;
using WGraph = VV<Edge>;

void Read_Graph(Graph &g, int m, bool directed = false){
    REP(i, m){
        LL(u, v); u--; v--;
        g[u].pb(v);
        if(!directed) g[v].pb(u);
    }
}
void Read_Tree(Graph &g, bool directed = false) {Read_Graph(g, SZ(g) - 1, directed);}

void Read_Graph(WGraph &g, int m, bool directed = false){
    REP(i, m){
        LL(u, v, c); u--; v--;
        g[u].pb({v, c});
        if(!directed) g[v].pb({u, c});
    }
}
void Read_Tree(WGraph &g, bool directed = false) {Read_Graph(g, SZ(g) - 1, directed);}

Graph G;
V<> d, d2, ans, used;
int now = 1, x, y, diameter;

void dfs(int s, int depth = 0){
    if(d[s] != -1) return;
    d[s] = depth;
    for(auto v : G[s]) dfs(v, depth + 1);
}

void dfs2(int s, int depth = 0){
    if(d2[s] != -1) return;
    d2[s] = depth;
    for(auto v : G[s]) dfs2(v, depth + 1);
}

void dfs3(int k){
    if(used[k] or d[k] + d2[k] != diameter) return;
    used[k] = 1;
    if(SZ(G[k]) <= 2) ans.pb(now), now++;
    else{
        REPS(i, SZ(G[k]) - 2) ans.pb(now + i);
        ans.pb(now);
        now += SZ(G[k]) - 1;
    }
    for(auto v : G[k]) dfs3(v);
}

void solve(){
    int n = SZ(G);
    d.resize(n, -1);
    dfs(0);
    int MA = *max_element(all(d));
    REP(i, n) if(d[i] == MA){
        x = i;
        break;
    }
    d2.resize(n, -1);
    dfs2(x);
    diameter = *max_element(all(d2));
    REP(i, n) if(d2[i] == diameter){
        y = i;
        break;
    }
    REP(i, n) d[i] = -1;
    dfs(y);
    REP(i, n) if(d[i] + d2[i] - diameter > 2){
        print(-1);
        exit(0);
    } 
    //構築可能
    used.resize(n, 0);
    dfs3(x);
    auto ans2 = ans;
    REP(i, n) used[i] = 0;
    now = 1;
    ans.clear();
    dfs3(y);
    chmin(ans, ans2);
    for(auto v: ans) cout << v <<" ";
    cout << endl;
}

int main(){
    INT(n);
    G.resize(n);
    Read_Tree(G);
    solve();
}


Measured memory_bytes: 19700