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[][] 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;
		}
		
		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]+WF[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));}
}

class Pair : IComparable<Pair> {
	public int Pos;
	public int Cost;
	public Pair(int p, int c) {
		Pos = p; Cost = c;
	}
	public int CompareTo(Pair t) {
		//return this.Cost > t.Cost ? -1 : this.Cost < t.Cost ? 1 : 0;
		return this.Cost > t.Cost ? 1 : this.Cost < t.Cost ? -1 : 0;
	}
}


class SkewHeap<T> where T:IComparable<T>{
	public int Count{
		get{return cnt;}
		private set{cnt=value;}
	}
	
	public SkewHeap(){
		root=null;
		this.Count=0;
	}
	
	public void Push(T v){
		NodeSH<T> p=new NodeSH<T>(v);
		root=NodeSH<T>.Meld(root,p);
		this.Count++;
	}
	
	public void Pop(){
		if(root==null)return;
		root=NodeSH<T>.Meld(root.L,root.R);
		this.Count--;
	}
	
	public T Top{
		get{return root.Val;}
	}
	
	int cnt;
	NodeSH<T> root;
	
	class NodeSH<S> where S : IComparable<S> {
		public NodeSH<S> L, R;
		public S Val;

		public NodeSH(S v){
			Val = v;
			L = null; R = null;
		}
		public static NodeSH<S> Meld(NodeSH<S> a, NodeSH<S> b){
			if(a == null)return b;
			if (b == null) return a;
			if (a.Val.CompareTo(b.Val) > 0) swap(ref a, ref b);
			a.R = Meld(a.R, b);
			swap(ref a.L, ref a.R);
			return a;
		}

		static void swap<U>(ref U x, ref U y) {
			U t = x; x = y; y = t;
		}
	}
}