Problem: JATC loves Banh-mi (a Vietnamese food). His affection for Banh-mi is so much that he always has it for breakfast. This morning, as usual, he buys a Banh-mi and decides to enjoy it in a special way.

First, he splits the Banh-mi into n parts, places them on a row and numbers them from 1 through n. For each part i, he defines the deliciousness of the part as x_i ∈ \{0, 1\}. JATC's going to eat those parts one by one. At each step, he chooses arbitrary remaining part and eats it. Suppose that part is the i-th part then his enjoyment of the Banh-mi will increase by x_i and the deliciousness of all the remaining parts will also increase by x_i. The initial enjoyment of JATC is equal to 0.

For example, suppose the deliciousness of 3 parts are [0, 1, 0]. If JATC eats the second part then his enjoyment will become 1 and the deliciousness of remaining parts will become [1, \\_, 1]. Next, if he eats the first part then his enjoyment will become 2 and the remaining parts will become [\\_, \\_, 2]. After eating the last part, JATC's enjoyment will become 4.

However, JATC doesn't want to eat all the parts but to save some for later. He gives you q queries, each of them consisting of two integers l_i and r_i. For each query, you have to let him know what is the maximum enjoyment he can get if he eats all the parts with indices in the range [l_i, r_i] in some order.

All the queries are independent of each other. Since the answer to the query could be very large, print it modulo 10^9+7.

Input

The first line contains two integers n and q (1 ≤ n, q ≤ 100 000).

The second line contains a string of n characters, each character is either '0' or '1'. The i-th character defines the deliciousness of the i-th part.

Each of the following q lines contains two integers l_i and r_i (1 ≤ l_i ≤ r_i ≤ n) — the segment of the corresponding query.

Output

Print q lines, where i-th of them contains a single integer — the answer to the i-th query modulo 10^9 + 7.

Examples

Input

4 2
1011
1 4
3 4


Output

14
3


Input

3 2
111
1 2
3 3


Output

3
1

Note

In the first example: 

  * For query 1: One of the best ways for JATC to eats those parts is in this order: 1, 4, 3, 2. 
  * For query 2: Both 3, 4 and 4, 3 ordering give the same answer. 



In the second example, any order of eating parts leads to the same answer.

Solution (in JAVA):

Solution:
import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws IOException {
        Scanner scn=new Scanner(System.in);
        BufferedWriter output = new BufferedWriter(
            new OutputStreamWriter(System.out));
        int p=1000000000+7;
        int[] arr=new int[100001];
        arr[0]=1;
        for(int i=1;i<=100000;i++){
            arr[i]=arr[i-1]*2;
            arr[i]=arr[i]%p;
        }
        int n=scn.nextInt();
        int q=scn.nextInt();
        String s=scn.next();
        int[] arr1=new int[n+1];
        int[] arr0=new int[n+1];
        for(int i=1;i<=n;i++){
            if(s.charAt(i-1)=='0'){
                arr1[i]=arr1[i-1];
                arr0[i]=arr0[i-1]+1;
            }
            else{
                arr1[i]=arr1[i-1]+1;
                arr0[i]=arr0[i-1];
            }
        }
        for(int i=0;i<q;i++){
            int l=scn.nextInt();
            int r=scn.nextInt();
            int a=arr1[r]-arr1[l-1];
            int b=arr0[r]-arr0[l-1];
            long ans=(arr[a]-1)*(long)(arr[b]);
            ans=ans%p;
            output.write((int)(ans)+"\n");
        }
        output.close();
    }
}