#include 
#include 
#include 
using namespace std;
const int maxn = 100005;
vector graph[maxn];

vector bfs(int S) {
    vector path;
    
    vector visited(maxn, false);
    visited[S] = true;
    queue q;
    q.push(S);
    
    while(!q.empty()) {
        int node = q.front();
        q.pop();
        
        path.push_back(node);
        
        for(int neighbour : graph[node]) {
            if(!visited[neighbour]) {
                visited[neighbour] = true;
                q.push(neighbour);
            }
        }

    }
    return path;
}

int main() {
    int k;
    cin >> k;
    
    for(int i = 1; i < k; i++) {
        int a, b;
        cin >> a >> b;
        graph[a].push_back(b);
        graph[b].push_back(a);
    }
    
    vector p1 = bfs(0);
    
    for(int i = 0; i < p1.size(); i++) {
        cout << p1[i] << " " ;
    }
    
    vector p2 = bfs(k);
    for(int i = (int) p2.size() - 1; i >= 0; i--) {
        cout << p2[i] << " ";
    }
    return 0;
}