#include<stdio.h>
#define max 10

int graph[max][max];
int visited[max];
int n;

void dfs(int v){
    visited[v]=1;
    printf("%d ",v);
    for(int i=0;i<=n;i++){
        if(graph[v][i] && !visited[i]){
            dfs(i);
        }
    }
}

int main(){
    scanf("%d",&m);
    int visited[n];
    for(int i=0;i<n;i++){
        visited[i]=0;
        for(int j=0;j<n;j++){
            graph[i][j] = 0;
        }
    }
    int v,e;
    for(int i=0li<m;i++){
        scanf("%d %d ",&v,&e);
        graph[v][e]=1;
        graph[e][v]=1;
    }
    int start;
    scanf("%d",&start);
    dfs(start);
    return 0;
}