/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] lines = br.readLine().split(" ");
        int n = Integer.parseInt(lines[0]);
        int m = Integer.parseInt(lines[1]);
        int s = Integer.parseInt(lines[2]);
        int g = Integer.parseInt(lines[3]);
        
        ArrayList<Station> stations = new ArrayList<Station>();
        for(int i=0;i<n;i++){
            stations.add(new Station(i));
        }
        stations.get(s).min_cost = 0;
        stations.get(s).min_route.add(s);
        
        for(int i=0;i<m;i++){
            lines = br.readLine().split(" ");
            int a = Integer.parseInt(lines[0]);
            int b = Integer.parseInt(lines[1]);
            int c = Integer.parseInt(lines[2]);
            stations.get(a).addNext(stations.get(b),c);
            stations.get(b).addNext(stations.get(a),c);
        }
        PriorityQueue<Station> queue = new PriorityQueue<Station>(200,(a,b)->a.compare(b));
        queue.add(stations.get(s));
        while(queue.size()!=0){
            Station sta = queue.poll();
            for(Route route:sta.next){
                Station clone = sta.clone();
                clone.min_route.add(route.station.no);
                clone.min_cost += route.cost;
                if(clone.compare(route.station) < 0){
                    route.station.min_route = new ArrayList<Integer>(clone.min_route);
                    route.station.min_cost = clone.min_cost;
                    queue.add(route.station);
                }
            }
        }
        System.out.println(stations.get(g).toString());
    }
    
    public static class Station{
        public ArrayList<Route> next = new ArrayList<Route>();
        
        public int no;
        public int min_cost = Integer.MAX_VALUE;
        public ArrayList<Integer> min_route = new ArrayList<Integer>();
        
        public Station(int no){
            this.no = no;
        }
        public void addNext(Station station,int cost){
            next.add(new Route(station,cost));
        }
        public int compare(Station target){
            if(this.min_cost != target.min_cost){
                return this.min_cost - target.min_cost;
            }else{
                int n = Math.min(this.min_route.size(),target.min_route.size());
                for(int i=0;i<n;i++){
                    if(this.min_route.get(i) != target.min_route.get(i)){
                        return this.min_route.get(i) - target.min_route.get(i);
                    }
                }
            }
            return 0;
        }
        public Station clone(){
            Station new_obj = new Station(this.no);
            new_obj.min_cost = this.min_cost;
            new_obj.min_route = new ArrayList<Integer>(this.min_route);
            new_obj.next = this.next;   //ディープコピーしなくてもOK
            return new_obj;
        }
        
        public String toString(){
            StringBuilder sb = new StringBuilder();
            for(int route:min_route){
                if(sb.length() != 0){
                    sb.append(" ");
                }
                sb.append(route);
            }
            return sb.toString();
        }
    }
    public static class Route{
        public Station station;
        public int cost;
        public Route(Station station,int cost){
            this.station = station;
            this.cost = cost;
        }
    }
}