#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
int co[10010][30] = {};
int main() {
	int n, q;
	cin >> n >> q;
	string s;
	cin >> s;
	for (int i = 1; i <= n; i++) {
		co[i][int(s[i - 1] - 'a')]++;
		for (int j = 0; j < 26; j++) {
			co[i][j] += co[i - 1][j];
		}
	}
	for (int i = 0; i < q; i++) {
		int l, r, x;
		cin >> l >> r >> x;
		int co1 = 0;
		for (int j = 0; j < 26; j++) {
			if (x <= co1 + co[r][j] - co[l - 1][j]) {
				cout << char('a' + j) << endl;
				break;
			}
			else {
				co1 += co[r][j] - co[l - 1][j];
			}
		}
	}
}