#include<stdio.h>
#include<stdlib.h>
void DFS(int sour,int **mat,int *visited,int V){
    printf("%d",sour);
    visited[sour]=1;
    for(int i=0;i<V;i++){
        if(mat[sour][i]!=0 &&visited[i]==0)
        DFS(i,mat,visited,V);
    }
}
int main(){
    V,E,r,c,sour,u,v,w,itr;
    scanf("%d",&V);
    if(V<0){
        printf("Invalid input";
        return 0;)
    }
    scanf("%d",&E);
    int **mat;
    int *visited;
    mat=(int**)malloc(V *sizeof(int*));
    for(r=0;r<V;r++)
        mat[r]=(int*)malloc(V * sizeof(int));
        for(itr=1;itr<=E;itr++){
        scanf("%d%d%d",&u,&v,&w);
        mat[u][v]=w;
            
        }
        scanf("%d",&sour);
        visited=(int*)malloc(V * sizeof(int));
        printf("%d ",sour);
        DFS(sour,mat,visited,V);
        return 0;
        
}