#include <bits/stdc++.h>

using namespace std;
using ll = long long;

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){
        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;
}