#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define R cin>>
#define ll long long
#define ln cout<<'\n'
#define in(a) insert(a)
#define pb(a) push_back(a)
#define pd(a) printf("%.10f\n",a)
#define mem(a) memset(a,0,sizeof(a))
#define all(c) (c).begin(),(c).end()
#define iter(c) __typeof((c).begin())
#define rrep(i,n) for(ll i=(ll)(n)-1;i>=0;i--)
#define REP(i,m,n) for(ll i=(ll)(m);i<(ll)(n);i++)
#define rep(i,n) REP(i,0,n)
#define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++)
ll check(ll n,ll m,ll x,ll y){return x>=0&&x<n&&y>=0&&y<m;}void pr(){ln;}
template<class A,class...B>void pr(const A &a,const B&...b){cout<<a<<(sizeof...(b)?" ":"");pr(b...);}
template<class A>void PR(A a,ll n){rep(i,n)cout<<(i?" ":"")<<a[i];ln;}
const ll MAX=1e9+7,MAXL=1LL<<61,dx[8]={-1,0,1,0,-1,-1,1,1},dy[8]={0,1,0,-1,-1,1,1,-1};
typedef pair<ll,ll> P;


class BIT{
public:
  ll n,bit[555555];
  BIT(){fill(bit,bit+555555,0);}
  void add(ll i,ll x){
    while(i<=n){
      bit[i]+=x;
      i+=i&-i;
    }
  }
  ll sum(ll i){
    ll s=0;
    while(i>0){
      s+=bit[i];
      i-=i&-i;
    }
    return s;
  }
};

BIT b[26];

void Main() {
  ll n,T;
  string s;
  cin >> n >> T >> s;
  rep(i,26) {
    b[i]=BIT();
    b[i].n=n+1;
  }
  rep(i,n) {
    ll x=s[i]-'a';
    b[x].add(i+1,1);
  }
  while(T--) {
    ll l,r,x;
    cin >> l >> r >> x;
    ll c[26];
    mem(c);
    rep(i,26) c[i]=b[i].sum(r)-b[i].sum(l-1);
    ll sum=0;
    rep(i,26) {
      sum+=c[i];
      if(sum>=x) {
        pr((char)(i+'a'));
        break;
      }
    }
  }
}

int main(){ios::sync_with_stdio(0);cin.tie(0);Main();return 0;}