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.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.io.BufferedWriter;
import java.util.PriorityQueue;
import java.util.InputMismatchException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.Queue;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author I_love_PloadyFree
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		OutputWriter out = new OutputWriter(outputStream);
		TaskE solver = new TaskE();
		solver.solve(1, in, out);
		out.close();
	}

	static class TaskE {
		private int n;
		private int m;
		private List<Edge>[] g;
		private int start;

		public void solve(int testNumber, InputReader in, OutputWriter out) {
			input(in);

			Edge[] result = dijkstra();
			out.printLine(getSum(result));
			for (Edge edge : result) {
				if (edge != null) {
					out.print(edge.getIndex());
					out.print(" ");
				}
			}
		}

		private long getSum(Edge[] a) {
			long sum = 0;
			for (Edge edge : a)
				if (edge != null)
					sum += edge.getWeight();
			return sum;
		}

		private Edge[] dijkstra() {
			long[] dist = ArrayUtils.createArray(n, Long.MAX_VALUE);
			dist[start] = 0;
			Queue<Integer> q = new PriorityQueue<>((v1, v2) -> Long.compare(dist[v1], dist[v2]));
			q.add(start);

			Edge[] parent = new Edge[n];
			while (!q.isEmpty()) {
				int cur = q.poll();
				g[cur].forEach(edge -> {
					int to = edge.getTo();
					long newLen = dist[cur] + edge.getWeight();
					if (dist[to] > newLen) {
						dist[to] = newLen;
						q.add(to);
						parent[to] = edge;
					} else if (dist[to] == newLen) {
						if (parent[to].getWeight() > edge.getWeight()) {
							parent[to] = edge;
						}
					}
				});
			}

			return parent;
		}

		private void input(InputReader in) {
			n = in.readInt();
			m = in.readInt();

			g = new List[n];
			for (int i = 0; i < n; i++)
				g[i] = new ArrayList<>();

			for (int i = 0; i < m; i++) {
				int s = in.readInt() - 1;
				int f = in.readInt() - 1;
				int w = in.readInt();
				g[s].add(new Edge(s, f, w, i + 1));
				g[f].add(new Edge(f, s, w, i + 1));
			}

			start = in.readInt() - 1;
		}

	}

	static class Edge {
		private final int from;
		private final int to;
		private final int weight;
		private final int index;

		public Edge(int from, int to, int weight, int index) {
			this.from = from;
			this.to = to;
			this.weight = weight;
			this.index = index;
		}

		public int getTo() {
			return to;
		}

		public int getWeight() {
			return weight;
		}

		public int getIndex() {
			return index;
		}


		public String toString() {
			return "Edge{" +
				"from=" + from +
				", to=" + to +
				", weight=" + weight +
				", index=" + index +
				'}';
		}

	}

	static class OutputWriter {
		private final PrintWriter writer;

		public OutputWriter(OutputStream outputStream) {
			writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
		}

		public OutputWriter(Writer writer) {
			this.writer = new PrintWriter(writer);
		}

		public void print(Object... objects) {
			for (int i = 0; i < objects.length; i++) {
				if (i != 0)
					writer.print(' ');
				writer.print(objects[i]);
			}
		}

		public void close() {
			writer.close();
		}

		public void printLine(long i) {
			writer.println(i);
		}

		public void print(int i) {
			writer.print(i);
		}

	}

	static class ArrayUtils {
		public static long[] createArray(int count, long value) {
			long[] array = new long[count];
			Arrays.fill(array, value);
			return array;
		}

	}

	static class InputReader {
		private InputStream stream;
		private byte[] buf = new byte[1024];
		private int curChar;
		private int numChars;
		private SpaceCharFilter filter;

		public InputReader(InputStream stream) {
			this.stream = stream;
		}

		public int read() {
			if (numChars == -1)
				throw new InputMismatchException();
			if (curChar >= numChars) {
				curChar = 0;
				try {
					numChars = stream.read(buf);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (numChars <= 0)
					return -1;
			}
			return buf[curChar++];
		}

		public int readInt() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			int res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res *= 10;
				res += c - '0';
				c = read();
			} while (!isSpaceChar(c));
			return res * sgn;
		}

		public boolean isSpaceChar(int c) {
			if (filter != null)
				return filter.isSpaceChar(c);
			return isWhitespace(c);
		}

		public static boolean isWhitespace(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		public interface SpaceCharFilter {
			public boolean isSpaceChar(int ch);

		}

	}
}