using System;
using System.Collections;
using System.Collections.Generic;
 
class TEST{
	static void Main(){
		Sol mySol =new Sol();
		mySol.Solve();
	}
}

class Sol{
	public void Solve(){
		
		int Inf=(int)(1e9);
		bool[,] canGo=new bool[N,N];
		int[,] dist=new int[N,N];
		
		int[][] WF=new int[N][];
		for(int i=0;i<N;i++){
			WF[i]=new int[N];
			for(int j=0;j<N;j++)WF[i][j]=(i==j)?0:Inf;
		}
		
		
		
		for(int i=0;i<M;i++){
			var dd=ria();
			WF[dd[0]][dd[1]]=WF[dd[1]][dd[0]]=dd[2];
			canGo[dd[0],dd[1]]=canGo[dd[1],dd[0]]=true;
			dist[dd[0],dd[1]]=dist[dd[1],dd[0]]=dd[2];
		}
		
		for(int k=0;k<N;k++){
			for(int i=0;i<N;i++){
				for(int j=0;j<N;j++){
					WF[i][j]=Math.Min(WF[i][j],WF[i][k]+WF[k][j]);
				}
			}
		}
		
		List<int> L=new List<int>();
		int now=S;
		while(now!=G){
			L.Add(now);
			for(int i=0;i<N;i++){
				if(!canGo[now,i])continue;
				if(WF[now][G]==WF[i][G]+dist[now,i]){
					now=i;
					break;
				}
			}
		}
		L.Add(now);
		
		var AA=L.ToArray();
		Console.WriteLine(String.Join(" ",AA));
		
	}
	int N,M;
	int S,G;
	
	public Sol(){
		var d=ria();
		N=d[0];M=d[1];S=d[2];G=d[3];
	}

	


	static String rs(){return Console.ReadLine();}
	static int ri(){return int.Parse(Console.ReadLine());}
	static long rl(){return long.Parse(Console.ReadLine());}
	static double rd(){return double.Parse(Console.ReadLine());}
	static String[] rsa(){return Console.ReadLine().Split(' ');}
	static int[] ria(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>int.Parse(e));}
	static long[] rla(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>long.Parse(e));}
	static double[] rda(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>double.Parse(e));}
}