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();
        String s = sc.next();
        int[][] counts = new int[n + 1][26];
        for (int i = 1; i <= n; i++) {
            System.arraycopy(counts[i - 1], 0, counts[i], 0, 26);
            counts[i][s.charAt(i - 1) - 'a']++;
        }
        String result = IntStream.range(0, q).mapToObj(i -> {
            int left = sc.nextInt() - 1;
            int right = sc.nextInt();
            int x = sc.nextInt();
            int idx = -1;
            int current = 0;
            while (current < x) {
                idx++;
                current += counts[right][idx] - counts[left][idx];
            }
            return String.valueOf((char)(idx + 'a'));
        }).collect(Collectors.joining("\n"));
        System.out.println(result);
    }
}
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();
        }
    }
    
}