#line 1 "main.cpp"
#include <iostream>
#include <algorithm>
#include <numeric>
#include <vector>
#include <string>

using namespace std;
using lint = long long;

void solve() {
    int n, q;
    cin >> n >> q;

    vector<vector<int>> cnt(n + 1, vector(26, 0));
    for (int i = 1; i <= n; ++i) {
        cnt[i] = cnt[i - 1];

        char c;
        cin >> c;
        ++cnt[i][c - 'a'];
    }

    while (q--) {
        int l, r, x;
        cin >> l >> r >> x;
        --l;

        for (int c = 0; c < 26; ++c) {
            auto pcnt = cnt[r][c] - cnt[l][c];
            if (x <= pcnt) {
                cout << char('a' + c) << "\n";
                break;
            }
            x -= pcnt;
        }
    }
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    solve();

    return 0;
}