#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;
using mint = modint998244353;

int main() {
  int N, Q, L, R, X;
  cin >> N >> Q;
  string T;
  cin >> T;
  vector<vector<int>> S(26, vector<int>(N + 1));
  for (int i = 1; i <= N; i++) {
    S[T[i - 1] - 'a'][i]++;
    for (int j = 0; j < 26; j++) S[j][i] += S[j][i - 1];
  }
  while (Q--) {
    cin >> L >> R >> X;
    for (int i = 0; i < 26; i++) {
      X -= S[i][R] - S[i][L - 1];
      if (X <= 0) {
        cout << char(i + 'a') << endl;
        break;
      }
    }
  }
  return 0;
}