/*

Code for problem C by cookiedoth
Generated 09 Apr 2021 at 03.34 PM


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¯\_(ツ)_/¯
^_^
-_-

*/

#include <iostream>
#include <fstream>
#include <vector>
#include <set>
#include <map>
#include <bitset>
#include <algorithm>
#include <iomanip>
#include <cmath>
#include <ctime>
#include <functional>
#include <unordered_set>
#include <unordered_map>
#include <string>
#include <queue>
#include <deque>
#include <stack>
#include <complex>
#include <cassert>
#include <random>
#include <cstring>
#include <numeric>
#include <random>
#include <utility>
#include <tuple>
#include <chrono>
#define ll long long
#define ld long double
#define null NULL
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define debug(a) cerr << #a << " = " << a << endl
#define forn(i, n) for (int i = 0; i < n; ++i)
#define length(a) (int)a.size()

using namespace std;

template<class T> int chkmax(T &a, T b) {
	if (b > a) {
		a = b;
		return 1;
	}
	return 0;
}

template<class T> int chkmin(T &a, T b) {
	if (b < a) {
		a = b;
		return 1;
	}
	return 0;
}

template<class iterator> void output(iterator begin, iterator end, ostream& out = cerr) {
	while (begin != end) {
		out << (*begin) << " ";
		begin++;
	}
	out << endl;
}

template<class T> void output(T x, ostream& out = cerr) {
	output(x.begin(), x.end(), out);
}

void fast_io() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
}

const int K = 26;
const int mx = 1e4 + 228;
int n, q;
string s;
int pref[mx][K];

signed main() {
	fast_io();
	cin >> n >> q;
	cin >> s;
	for (int i = 0; i < n; ++i) {
		copy(pref[i], pref[i] + K, pref[i + 1]);
		pref[i + 1][s[i] - 'a']++;
	}
	for (int i = 0; i < q; ++i) {
		int l, r, x;
		cin >> l >> r >> x;
		l--;
		r--;
		x--;
		for (int j = 0; j < K; ++j) {
			if (x < pref[r + 1][j] - pref[l][j]) {
				cout << (char)('a' + j) << '\n';
				break;
			} else {
				x -= pref[r + 1][j] - pref[l][j];
			}
		}
	}
}