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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int q = sc.nextInt();
        char[] inputs = sc.next().toCharArray();
        int[][] counts = new int[n + 1][26];
        for (int i = 1; i <= n; i++) {
            for (int j = 0; j < 26; j++) {
                counts[i][j] = counts[i - 1][j];
            }
            counts[i][inputs[i - 1] - 'a']++;
        }
        StringBuilder sb = new StringBuilder();
        while (q-- > 0) {
            int left = sc.nextInt();
            int right = sc.nextInt();
            int idx = sc.nextInt();
            int[] current = new int[26];
            for (int i = 0; i < 26; i++) {
                current[i] = counts[right][i] - counts[left - 1][i];
            }
            int ans = 0;
            int value = 0;
            for (int i = 0; i < 26 && value < idx; i++) {
                value += current[i];
                ans = i;
            }
            sb.append((char)(ans + 'a')).append("\n");
        }
        System.out.print(sb);
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}