Problem: Petya once wrote a sad love song and shared it to Vasya. The song is a string consisting of lowercase English letters. Vasya made up q questions about this song. Each question is about a subsegment of the song starting from the l-th letter to the r-th letter. Vasya considers a substring made up from characters on this segment and repeats each letter in the subsegment k times, where k is the index of the corresponding letter in the alphabet. For example, if the question is about the substring "abbcb", then Vasya repeats letter 'a' once, each of the letters 'b' twice, letter 'c" three times, so that the resulting string is "abbbbcccbb", its length is 10. Vasya is interested about the length of the resulting string.

Help Petya find the length of each string obtained by Vasya.

Input

The first line contains two integers n and q (1≤ n≤ 100 000, 1≤ q ≤ 100 000) — the length of the song and the number of questions. 

The second line contains one string s — the song, consisting of n lowercase letters of English letters.

Vasya's questions are contained in the next q lines. Each line contains two integers l and r (1 ≤ l ≤ r ≤ n) — the bounds of the question.

Output

Print q lines: for each question print the length of the string obtained by Vasya.

Examples

Input


7 3
abacaba
1 3
2 5
1 7


Output


4
7
11


Input


7 4
abbabaa
1 3
5 7
6 6
2 4


Output


5
4
1
5


Input


13 7
sonoshikumiwo
1 5
2 10
7 7
1 13
4 8
2 5
3 9


Output


82
125
9
191
62
63
97

Note

In the first example Vasya is interested in three questions. In the first question Vasya considers the substring "aba", that transforms to "abba", so the answer is equal to 4. In the second question Vasya considers "baca", that transforms to "bbaccca", so the answer is 7. In the third question Vasya considers the string "abacaba",that transforms to "abbacccabba" of length 11.

Solution (in JAVA):

Solution:
import java.util.*;
import java.lang.*;
import java.io.*;
 public class main{
	 static class FastReader {
        BufferedReader br;
        StringTokenizer st;
 
        public FastReader()
        {
            br = new BufferedReader(
                new InputStreamReader(System.in));
        }
 
        String next()
        {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
 
        int nextInt() { return Integer.parseInt(next()); }
 
        long nextLong() { return Long.parseLong(next()); }
 
        double nextDouble()
        {
            return Double.parseDouble(next());
        }
 
        String nextLine()
        {
            String str = "";
            try {
                str = br.readLine();
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }

	public boolean polycarp(String testStr, int n){
		int[] hash = new int[26];
		hash[(int) testStr.charAt(0)-65]=1;
		for(int i=1;i < n;i++){
			if(testStr.charAt(i) != testStr.charAt(i-1)){
				if(hash[(int)testStr.charAt(i)-65] == 0){
					hash[(int)testStr.charAt(i)-65]=1;
				}else{
					return false;
				}
			}
		}
		return true;
	}

	public static boolean ordinaryNumber(int d, int k, long n){
		long number = 0;
		int count=0;
		while(count<=k){
			number= number*10 + 1;
			count++;
		}
		number *= d;
		if(number<=n){return true;}
		return false;
	}
public static long fastPower(long a, long b){
        long mod = 1000000007;
        if(b == 0){
            return 1;
        }else if(b==1){
            return a;
        }else{
            if(b%2 ==0 ){
                long ans = fastPower(a,b/2);
                return (ans*ans)%mod;
            }else{
                long ans = fastPower(a, (b-1)/2);
                return ((a*ans)%mod*ans)%mod;
            }
        }
    }
    
	public long customCount(long n){
		long answer=0;
		for(int i=1;i<10;i++){
			for(int j=0;j<9;j++){
				if(ordinaryNumber(i,j,n)){
					answer++;
				}
			}
		}
		return answer;
	}
	// Best Input reader for java
	static class InputReader
    {
        public BufferedReader reader;
        public StringTokenizer tok;
 
        public InputReader(InputStream inputStream)
        {
            reader =new BufferedReader(new InputStreamReader(inputStream));
            tok=null;
        }
 
        public InputReader(String inputFile) throws FileNotFoundException
        {
            reader=new BufferedReader(new FileReader(inputFile));
            tok=null;
        }
 
        public String nextLine()
        {
            String c="";
            try
            {
                c+=reader.readLine();
            }
            catch(IOException e)
            {
                throw new RuntimeException(e);
            }
 
            return c;
        }
 
        public String next()
        {
            while(tok==null || !tok.hasMoreTokens())
            {
                try
                {
                    tok=new StringTokenizer(nextLine());
                }
                catch(Exception e)
                {
                    throw new RuntimeException(e);
                }
            }
 
            return tok.nextToken();
        }
 
        public int nextInt()
        {
            return Integer.parseInt(next());
        }
 
        public long nextLong()
        {
            return Long.parseLong(next());
        }
 
        public double nextDouble()
        {
            return Double.parseDouble(next());
        }
    }
	
	public static void main(String args[]){
		InputReader  scan = new InputReader(System.in);
		PrintWriter out = new PrintWriter(System.out);
		main mn = new main();
		int n = scan.nextInt();
		int q = scan.nextInt();
		// scan.nextLine();
		String s = scan.nextLine();
		int k = s.length();

		int[] preSum = new int[k];
		int[] hashT = new int[k];

		for(int i=0;i<k;i++){
			hashT[i] = (int) s.charAt(i) -96;
		}

		preSum[0] = (int)s.charAt(0) - 96;


		for(int i=1;i<k;i++){
			preSum[i] += hashT[i] + preSum[i-1];
		}


		int length = 0;
		while(q-->0){
			length = 0;
			int l = scan.nextInt()-1;
			int r = scan.nextInt()-1;
			
			if(l == 0){
				length = preSum[r];
			}else{
				length = preSum[r] - preSum[l-1];
			}
		
			out.println(length);

		}
		out.flush();

	}

		 
// =============VERY IMPORTANT QUESTION===========
	// public static void main (String[] args) throws java.lang.Exception
	// {
	// 	InputReader s = new InputReader(System.in);
	// 	PrintWriter out = new PrintWriter(System.out);
	// 	int t = s.nextInt();
	// 	while(t-->0){
	// 		int n = s.nextInt();
	// 		int m = s.nextInt();
	// 		int[] A = new int[n+1];
	// 		for(int i=0;i<n;i++){
	// 			A[i+1] = s.nextInt();
	// 		}
	// 		int[] B =new int[m];
	// 		for(int i=0;i<m;i++){
	// 			B[i] = s.nextInt();
	// 		}
	// 		int[] auxArr = new int[n+1];
	// 		Arrays.fill(auxArr,2*n);
	// 		for(int i=1;i<=n;i++){
	// 			if(A[i] != 0){
	// 				auxArr[i]=0;
	// 			}
	// 		}
	// 		int indexOfOne = -1;
	// 		for(int i=1;i<=n;i++){
	// 			if(auxArr[i] != 0){
	// 				if(indexOfOne != -1){
	// 					auxArr[i] = Math.min(auxArr[i],i - indexOfOne);
	// 				}
	// 			}
	// 			if(A[i]==1){
	// 				indexOfOne = i;
	// 			}

	// 		}
	// 		int indexOfTwo = n+1;
	// 		for(int i=n;i>=1;i--){
	// 			if(auxArr[i] != 0){
	// 				if(indexOfTwo != n+1){
	// 					auxArr[i] = Math.min(auxArr[i], indexOfTwo - i);
	// 				}
	// 			}
	// 			if(A[i]==2){
	// 				indexOfTwo = i;
	// 			}

	// 		}
	// 		for(int i=0;i<m;i++){
	// 			if(auxArr[B[i]] != 2*n){
	// 				out.print(auxArr[B[i]]);
	// 				out.print(" ");
	// 			}
	// 			else{
	// 				out.print(-1);
	// 				out.print(" ");
	// 			}
	// 		}
	// 		out.println();
	// 		out.println("============");
	// 	}
	// 	out.flush();
	// }
}