#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int N,Q; cin >> N >> Q;
    string S; cin >> S;
    vector<vector<int>> cnt(26, vector<int>(N + 1, 0));
    rep(i,N) cnt[S[i] - 'a'][i + 1]++;
    rep(c,26)rep(i,N) cnt[c][i + 1] += cnt[c][i];

    rep(_,Q) {
        int L,R,X; cin >> L >> R >> X; L--;
        rep(c,26) {
            X -= cnt[c][R] - cnt[c][L];
            if(X <= 0){ cout << char(c + 'a') << "\n"; break; }
        }
    }
}