#include <bits/stdc++.h>
using namespace std;
using lint = long long int;
using P = pair<int, int>;
using PL = pair<lint, lint>;
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
#define ALL(a)  (a).begin(),(a).end()
constexpr int MOD = 1000000007;
constexpr lint B1 = 1532834020;
constexpr lint M1 = 2147482409;
constexpr lint B2 = 1388622299;
constexpr lint M2 = 2147478017;
constexpr int INF = 2147483647;
void yes(bool expr) {cout << (expr ? "YES" : "NO") << "\n";}
template<class T>void chmax(T &a, const T &b) { if (a<b) a=b; }
template<class T>void chmin(T &a, const T &b) { if (b<a) a=b; }
#include <atcoder/all>
using namespace atcoder;
int main()
{
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int N, Q;
  cin >> N >> Q;
  string S;
  cin >> S;
  while(Q--) {
    int L, R, X;
    cin >> L >> R >> X;
    L--; R--;
    vector<int> cnt(26);
    FOR(i, L, R+1) cnt[S[i]-'a']++;
    int now = 0;
    REP(i, 26) {
      now += cnt[i];
      if(X <= now) {
        cout << (char)('a' + i) << "\n";
        break;
      }
    }
  }
}