#include "bits/stdc++.h"

using namespace std;
using ll = long long;

void Main(string S) {
    int N = S.size();
    int L, R, X;
    cin >> L >> R >> X;
    --L;
    vector<int> nchar(26, 0);
    for (int i = L; i < R; ++i) {
        nchar[S[i] - 'a'] += 1;
    }
    vector<int> s(27, 0);
    s[0] = 0;
    for (int i = 0; i < 26; ++i) {
        s[i + 1] = s[i] + nchar[i];
    }
    int ans = lower_bound(s.begin(), s.end(), X) - s.begin();
    cout << (char)('a' + ans - 1) << endl;
}

int main() {
    std::cout << std::fixed << std::setprecision(15);
    int N, Q;
    cin >> N >> Q;
    string S;
    cin >> S;
    while (Q--) {
        Main(S);
    }
    return 0;
}