#include <bits/stdc++.h>
using namespace std;

struct iofast_t {
    iofast_t() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr); cout.tie(nullptr);
    }
} iofast;

struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
    if constexpr (sizeof...(Args) == 0) return std::vector(arg, init);
    else return std::vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
    return vec(Element(), arg, args...);
}

template <typename T, typename Compare = less<T>>
T &chmin(T &l, T r, Compare &&f = less<T>()) { return l = min(l, r, f); }
template <typename T, typename Compare = less<T>>
T &chmax(T &l, T r, Compare &&f = less<T>()) { return l = max(l, r, f); }

int main() {
    int n, q; cin >> n >> q;
    string s; cin >> s;

    auto acc = vec<int>(uns, n + 1, CHAR_MAX + 1);
    fill(begin(acc[0]), end(acc[0]), 0);

    for (int i = 0; i < n; ++i) {
        for (char c = 'a'; c <= 'z'; ++c) {
            acc[i + 1][c] = acc[i][c] + (s[i] == c);
        }
    }

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

        int count[CHAR_MAX + 1] = {};
        for (char c = 'a'; c <= 'z'; ++c) {
            count[c] = acc[r][c] - acc[l][c];
        }

        char c = 'a' - 1;
        while (0 < x) {
            ++c;
            x -= count[c];
        }

        cout << c << endl;
    }
}