#include <bits/stdc++.h>
#define _overload(_1,_2,_3,name,...) name
#define _rep(i,n) _range(i,0,n)
#define _range(i,a,b) for(int i=(int)(a);i<(int)(b);++i)
#define rep(...) _overload(__VA_ARGS__,_range,_rep,)(__VA_ARGS__)
#define _all(arg) begin(arg),end(arg)

template<class T>bool chmax(T &a, const T &b) { return (a<b)?(a=b,1):0; }
template<class T>bool chmin(T &a, const T &b) { return (b<a)?(a=b,1):0; }

using namespace std;
using vi=vector<int>;

const int INF=1<<28;

int S, G;

int main() {
	int N, M; cin >> N >> M >> S >> G;
	vector<vi> edge(N, vi(N, INF));
	vector<vi> dist;
	rep(i, M) {
		int a, b, c; cin >> a >> b >> c;
		edge[a][b] = edge[b][a] = c;
	}
	rep(i, N) { edge[i][i] = 0; }

	dist = edge;

	rep(k, N) rep(i, N) rep(j, N) {
		chmin(dist[i][j], dist[i][k] + dist[k][j]);
	}

	int cur = S;
	vector<int> res;
	res.push_back(S);
	while (cur != G) {
		rep(i, N) {
			if (i == cur) continue;
			if(dist[S][cur] + edge[cur][i] + dist[i][G] 
					== dist[S][G]) {
				cur = i;
				res.push_back(i);
				break;
			}
		}
	}

	rep(i, res.size()-1) { cout << res[i] << " "; }
	cout << res[res.size()-1] << endl;

	return 0;
}