#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint1000000007;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000

int main(){
	
	int n,q;
	cin>>n>>q;
	
	string s;
	cin>>s;
	
	rep(i,q){
		
		int l,r,x;
		cin>>l>>r>>x;
		vector<int> cnt(26,0);
		for(int j=l-1;j<r;j++){
			cnt[s[j]-'a']++;
		}
		
		rep(j,26){
			if(x<=cnt[j]){
				cout<<(char)('a'+j)<<endl;
				break;
			}
			x -= cnt[j];
		}
		
	}
	
    return 0;
}