// editor4
#include<stdio.h>
#include<stdlib.h>
int **graph;
int *visited;
int n,m;
void dfs(int vertex)
{
    visited[vertex]=1;
    printf("%d ",vertex);
    for(int i=0;i<n;i++)
    {
        if(graph[vertex][i]!=0&&visited[i]==0)
            dfs(vertex);
    }
}
int main()
{
    int u,v,s;
    scanf("%d%d",&n,&m);
    graph=(int**)malloc(n*sizeof(int*));
    for(int i=0;i<n;i++)
        graph[i]=(int*)calloc(n,sizeof(int));
    visited=(int*)calloc(n,sizeof(int));
    for(int i=0;i<m;i++)
    {
        scanf("%d%d",&u,&v);
        graph[u][v]=1;
    }
    scanf("%d",&s);
    dfs(s);
}