import java.io.*;
import java.util.*;
import java.util.function.*;
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 length = inputs.length;
        int[][] counts = new int[length + 1][26];
        for (int i = 1; i <= length; 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 k = sc.nextInt();
            for (int i = 0; i < 26; i++) {
                k -= counts[right][i] - counts[left - 1][i];
                if (k <= 0) {
                    sb.append((char)(i + 'a')).append("\n");
                    break;
                }
            }
        }
        System.out.print(sb);
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}