#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i,n)for (int i = 0; i < int(n); ++i)
#define rrep(i,n)for (int i = int(n)-1; i >= 0; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
template<class T> void chmax(T& a, const T& b) {a = max(a, b);}
template<class T> void chmin(T& a, const T& b) {a = min(a, b);}
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, q;
    cin >> n >> q;
    string s;
    cin >> s;
    VVI hist(n + 1, VI(26));
    rep(i, n) rep(j, 26) hist[i + 1][j] = hist[i][j] + (s[i] - 'a' == j);
    while(q--) {
        int l, r, x;
        cin >> l >> r >> x;
        l--, x--;
        rep(j, 26) {
            int cnt = hist[r][j] - hist[l][j];
            int t = min(cnt, x);
            x -= t;
            cnt -= t;
            if (cnt) {
                cout << char('a' + j) << '\n';
                break;
            }
        }
    }
}