import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		int n = Integer.parseInt(sa[0]);
		int q = Integer.parseInt(sa[1]);
		char[] s = br.readLine().toCharArray();
		int[] l = new int[q];
		int[] r = new int[q];
		int[] x = new int[q];
		for (int i = 0; i < q; i++) {
			sa = br.readLine().split(" ");
			l[i] = Integer.parseInt(sa[0]) - 1;
			r[i] = Integer.parseInt(sa[1]);
			x[i] = Integer.parseInt(sa[2]);
		}
		br.close();

		int[][] c = new int[26][n + 1];
		for (int i = 0; i < 26; i++) {
			for (int j = 0; j < n; j++) {
				c[i][j + 1] = c[i][j];
				if (s[j] - 'a' == i) {
					c[i][j + 1]++;
				}
			}
		}
		PrintWriter pw = new PrintWriter(System.out);
		for (int i = 0; i < q; i++) {
			int sum = 0;
			for (int j = 0; j < 26; j++) {
				int d = c[j][r[i]] - c[j][l[i]];
				sum += d;
				if (sum >= x[i]) {
					pw.println((char) ('a' + j));
					break;
				}
			}
		}
		pw.flush();
	}
}