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

int n, q;
string s;
vector<vector<int>> cnt;

int main() {
  cin >> n >> q >> s;
  cnt.resize(26, vector<int>(n + 1, 0));
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < 26; ++j) cnt[j][i + 1] = cnt[j][i];
    ++cnt[s[i] - 'a'][i + 1];
  }
  while (q--) {
    int l, r, x;
    cin >> l >> r >> x;
    vector<int> v(26);
    --l;
    for (int i = 0; i < 26; ++i) v[i] = cnt[i][r] - cnt[i][l];
    char res;
    for (int i = 0; i < 26; ++i) {
      x -= v[i];
      if (x <= 0) {
        res = 'a' + i;
        break;
      }
    }
    cout << res << endl;
  }
  return 0;
}