import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int q = sc.nextInt();
        int[][] sums = new int[n + 1][];
        sums[0] = new int[26];
        char[] arr = sc.next().toCharArray();
        for (int i =1; i <= n; i++) {
            sums[i] = (int[])(sums[i - 1].clone());
            sums[i][arr[i - 1] - 'a']++;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < q; i++) {
            int left = sc.nextInt() - 1;
            int right = sc.nextInt();
            int x = sc.nextInt();
            for (int j = 0; j < 26; j++) {
                x -= sums[right][j] - sums[left][j];
                if (x <= 0) {
                    sb.append((char)(j + 'a')).append("\n");
                    break;
                }
            }
        }
        System.out.print(sb);
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}