Problem: Little girl Susie accidentally found her elder brother's notebook. She has many things to do, more important than solving problems, but she found this problem too interesting, so she wanted to know its solution and decided to ask you about it. So, the problem statement is as follows.

Let's assume that we are given a connected weighted undirected graph G = (V, E) (here V is the set of vertices, E is the set of edges). The shortest-path tree from vertex u is such graph G1 = (V, E1) that is a tree with the set of edges E1 that is the subset of the set of edges of the initial graph E, and the lengths of the shortest paths from u to any vertex to G and to G1 are the same. 

You are given a connected weighted undirected graph G and vertex u. Your task is to find the shortest-path tree of the given graph from vertex u, the total weight of whose edges is minimum possible.

Input

The first line contains two numbers, n and m (1 ≤ n ≤ 3·105, 0 ≤ m ≤ 3·105) — the number of vertices and edges of the graph, respectively.

Next m lines contain three integers each, representing an edge — ui, vi, wi — the numbers of vertices connected by an edge and the weight of the edge (ui ≠ vi, 1 ≤ wi ≤ 109). It is guaranteed that graph is connected and that there is no more than one edge between any pair of vertices.

The last line of the input contains integer u (1 ≤ u ≤ n) — the number of the start vertex.

Output

In the first line print the minimum total weight of the edges of the tree.

In the next line print the indices of the edges that are included in the tree, separated by spaces. The edges are numbered starting from 1 in the order they follow in the input. You may print the numbers of the edges in any order.

If there are multiple answers, print any of them.

Examples

Input

3 3
1 2 1
2 3 1
1 3 2
3


Output

2
1 2 


Input

4 4
1 2 1
2 3 1
3 4 1
4 1 2
4


Output

4
2 3 4 

Note

In the first sample there are two possible shortest path trees:

  * with edges 1 – 3 and 2 – 3 (the total weight is 3); 
  * with edges 1 – 2 and 2 – 3 (the total weight is 2); 



And, for example, a tree with edges 1 – 2 and 1 – 3 won't be a shortest path tree for vertex 3, because the distance from vertex 3 to vertex 2 in this tree equals 3, and in the original graph it is 1.

Solution (in JAVA):

Solution:
import java.util.*;
import java.util.regex.Pattern;
import java.io.*;
import java.lang.*;
import java.math.*;

import static java.lang.Math.*;

public class Solution implements Runnable {
	
	class Edge {
		int to, w, id;
		
		Edge(int to, int w, int id) {
			this.to = to;
			this.w = w;
			this.id = id;
		}
	}
	
	class Pair implements Comparable<Pair> {
		long di;
		int v;
		
		Pair(long di, int v) {
			this.di = di;
			this.v = v;
		}
		
		@Override
		public boolean equals(Object o) {
			if (!(o instanceof Pair))
				return false;
			Pair p = (Pair)(o);
			return di == p.di && v == p.v;
		}
		
		@Override
		public int compareTo(Pair p) {
			if (di != p.di)
				return (di < p.di ? -1 : 1);
			return v - p.v;
		}
	}
	
    void solve() throws Exception {
    	int n = sc.nextInt();
    	int m = sc.nextInt();
    	ArrayList<Edge>[] g = new ArrayList[n];
    	for (int i = 0; i < n; i++) {
    		g[i] = new ArrayList<Edge>();
    	}
    	int[] ww = new int[m];
    	for (int i = 0; i < m; i++) {
    		int v = sc.nextInt() - 1;
    		int u = sc.nextInt() - 1;
    		int w = sc.nextInt();
    		g[v].add(new Edge(u, w, i));
    		g[u].add(new Edge(v, w, i));
    		ww[i] = w;
    	}
    	int S = sc.nextInt() - 1;
    	long[] di = new long[n];
    	int[] prE = new int[n];
    	Arrays.fill(di, Long.MAX_VALUE);
    	di[S] = 0;
    	TreeSet<Pair> st = new TreeSet<Pair>();
    	st.add(new Pair(di[S], S));
    	while (!st.isEmpty()) {
    		int v = st.pollFirst().v;
    		for (int i = 0; i < g[v].size(); i++) {
    			Edge e = g[v].get(i);
    			if (di[e.to] >= di[v] + e.w) {
    				st.remove(new Pair(di[e.to], e.to));
    				di[e.to] = di[v] + e.w;
    				prE[e.to] = e.id;
    				st.add(new Pair(di[e.to], e.to));
    			}
    		}
    	}
    	long ans = 0;
    	for (int i = 0; i < n; i++) {
    		if (i != S) {
    			ans += ww[prE[i]];
    		}
    	}
    	out.println(ans);
    	for (int i = 0; i < n; i++) {
    		if (i != S) {
    			out.print((prE[i] + 1) + " ");
    		}
    	}
    }
    
    BufferedReader in;
    PrintWriter out;
    FastScanner sc;
    
    final String INPUT_FILE = "stdin";
    final String OUTPUT_FILE = "stdout";
    
    static Throwable throwable;
    
    public static void main(String[] args) throws Throwable {
        Thread thread = new Thread(null, new Solution(), "", (1 << 26));
        thread.start();
        thread.join();
        thread.run();
        if (throwable != null)
            throw throwable;
    }
    
    
    public void run() {
        try {
        	if (INPUT_FILE.equals("stdin"))
        		in = new BufferedReader(new InputStreamReader(System.in));
        	else
        		in = new BufferedReader(new FileReader(INPUT_FILE));
        	if (OUTPUT_FILE.equals("stdout"))
        		out = new PrintWriter(System.out);
        	else
        		out = new PrintWriter(new FileWriter(OUTPUT_FILE));
            sc = new FastScanner(in);
            solve();
        } catch (Exception e) {
            throwable = e;
        } finally {
            out.close();
        }
    }
}

class FastScanner {
    BufferedReader reader;
    StringTokenizer strTok;
    
    FastScanner(BufferedReader reader) {
        this.reader = reader;
    }
    
    public String nextToken() throws Exception {
        while (strTok == null || !strTok.hasMoreTokens())
            strTok = new StringTokenizer(reader.readLine());
        return strTok.nextToken();
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(nextToken());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(nextToken());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(nextToken());
    }
}