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.IOException;
import java.util.LinkedList;
import java.util.HashMap;
import java.util.Map;
import java.util.PriorityQueue;
import java.util.InputMismatchException;
import java.util.TreeMap;
import java.util.TreeSet;

public class PathsAndTrees {
	public static void main(String[] args) {
		FasterScanner sc = new FasterScanner();
		
		int N = sc.nextInt();
		int M = sc.nextInt();
		
		Node[] nodes = new Node[N + 1];
		for (int i = 1; i <= N; i++) {
			nodes[i] = new Node(i);
		}

//		HashMap<EdgeKey, Integer> edgeMap = new HashMap<EdgeKey, Integer>();
//		HashMap<EdgeKey, Long> edgeDists = new HashMap<EdgeKey, Long>();
		for (int i = 1; i <= M; i++) {
			int U = sc.nextInt();
			int V = sc.nextInt();
			long W = sc.nextLong();
			nodes[U].edges.add(new Edge(nodes[V], i, W));
			nodes[V].edges.add(new Edge(nodes[U], i, W));
//			EdgeKey k = new EdgeKey(U, V);
//			edgeMap.put(k, i);
//			edgeDists.put(k, W);
		}
		
		int S = sc.nextInt();
		
		PriorityQueue<PQElement> pq = new PriorityQueue<PQElement>();
		TreeMap<Node, TSItem> tm = new TreeMap<Node, TSItem>();
		TreeSet<Node> ts = new TreeSet<Node>();
		pq.add(new PQElement(nodes[S], null, 0, 0));
		tm.put(nodes[S], new TSItem(null, 0, 0));
		nodes[S].dist = 0;
		for (int i = 1; i <= N; i++) {
			ts.add(nodes[i]);
//			System.out.println("ADDINF");
		}
//		System.out.format("ts len = %d\n", ts.size());
		while (!ts.isEmpty()) {
			Node curr = ts.first();
			ts.remove(curr);
			for (Edge e : curr.edges) {
//				System.out.println("HERE");
				if (ts.contains(e.dest)) {
					ts.remove(e.dest);
					e.dest.dist = Math.min(e.dest.dist, curr.dist + e.length);
					ts.add(e.dest);
				}
			}
			
//			Node curr = tm.firstKey();
//			TSItem item = tm.get(curr);
//			curr.prev = item.prev;
//			curr.dist = item.dist;
//			for (Edge e : curr.edges) {
//				if (tm.containsKey(e.dest)) {
//					long oldDist = tm.get(e.dest).dist;
//					long minDist = Math.min(oldDist, curr.dist + e.length);
//					tm.put(e.dest, new TSItem(e.dest, minDist, e.length));
//				} else {
//					tm.put(e.dest, new TSItem(e.dest, curr.dist + e.length, e.length));
//				}
//			}
			
//			PQElement elt = pq.poll();
//			if (elt.dist < elt.node.dist) {
//				elt.node.prev = elt.prev;
//				elt.node.dist = elt.dist;
//			}
//			for (Edge e : elt.node.edges) {
//				if (elt.dist + e.length < e.dest.dist) { 
//					pq.add(new PQElement(e.dest, elt.node, elt.dist + e.length, e.length));
//				}
//			}
//			System.out.format("working on: node %d, len = %d\n", elt.node.index, elt.dist);
		}
		
//		for (int i = 1; i <= N; i++) {
//			System.out.format("idx = %d, dist = %d\n", i, nodes[i].dist);
//		}
		
		long distSum = 0;
		StringBuilder sb = new StringBuilder();
		for (int i = 1; i <= N; i++) {
			if (i != S) {
				long shortest = Long.MAX_VALUE;
				int edgeIdx = -1;
				for (Edge e : nodes[i].edges) {
					if ((nodes[i].dist - e.dest.dist == e.length) && (e.length < shortest)) {
						shortest = e.length;
						edgeIdx = e.index;
					}
				}
				distSum += shortest;
				sb.append(edgeIdx + " ");
//				EdgeKey k = new EdgeKey(nodes[i].index, nodes[i].prev.index);
//				long edgeDist = edgeDists.get(k);
//				int edgeNum = edgeMap.get(k);
//				distSum += edgeDist;
//				sb.append(edgeNum + " ");
			}
		}
		System.out.println(distSum);
		System.out.println(sb.toString());
	}
	
	public static class Edge {
		public Node dest;
		public int index;
		public long length;
		
		public Edge(Node d, int idx, long len) {
			this.dest = d;
			this.index = idx;
			this.length = len;
		}
	}
	
	public static class EdgeKey {
		public int U;
		public int V;
		
		public EdgeKey(int u, int v) {
			this.U = u;
			this.V = v;
		}
		
		@Override
		public int hashCode() {
			return (this.U ^ this.V);
		}
		
		@Override
		public boolean equals(Object obj) {
			EdgeKey ek = (EdgeKey)obj;
			return ((this.U == ek.U && this.V == ek.V) || (this.U == ek.V && this.V == ek.U));
		}
	}
	
	public static class TSItem implements Comparable<PQElement> {
		public Node prev;
		public long dist;
		public long fwdDist;
		
		public TSItem(Node p, long d, long f) {
			this.prev = p;
			this.dist = d;
			this.fwdDist = f;
		}
		
		public int compareTo(PQElement p) {
			if (this.dist < p.dist) {
				return -1;
			} else if (this.dist > p.dist) {
				return 1;
			} else {
				return 0;
			}
		}
	}
	
	public static class PQElement implements Comparable<PQElement> {
		public Node node;
		public Node prev;
		public long dist;
		public long fwdDist;
		
		public PQElement(Node n, Node p, long d, long f) {
			this.node = n;
			this.prev = p;
			this.dist = d;
			this.fwdDist = f;
		}
		
		public int compareTo(PQElement p) {
			if (this.dist < p.dist) {
				return -1;
			} else if (this.dist > p.dist) {
				return 1;
			} else {
				return 0;
			}
		}
	}
	
	public static class Node implements Comparable<Node> {
		public int index;
		public LinkedList<Edge> edges;
		public Node prev;
		public long prevLen;
		public long dist;
		
		public Node(int idx) {
			this.index = idx;
			this.edges = new LinkedList<Edge>();
			this.dist = Long.MAX_VALUE;
		}
		
		public int compareTo(Node n) {
			if (this.dist < n.dist) {
				return -1;
			} else if (this.dist > n.dist) {
				return 1;
			} else {
				return (this.index - n.index);
			}
		}
	}

	public static class FasterScanner {
		private byte[] buf = new byte[1024];
		private int curChar;
		private int numChars;

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

		public String nextLine() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isEndOfLine(c));
			return res.toString();
		}

		public String nextString() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		public long nextLong() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			long 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 int nextInt() {
			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 int[] nextIntArray(int n) {
			int[] arr = new int[n];
			for (int i = 0; i < n; i++) {
				arr[i] = nextInt();
			}
			return arr;
		}

		public long[] nextLongArray(int n) {
			long[] arr = new long[n];
			for (int i = 0; i < n; i++) {
				arr[i] = nextLong();
			}
			return arr;
		}

		private boolean isSpaceChar(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		private boolean isEndOfLine(int c) {
			return c == '\n' || c == '\r' || c == -1;
		}
	}
}