#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
void*wmem;
char memarr[96000000];
template<class T> inline void walloc1d(T **arr, int x, void **mem = &wmem){
  static int skip[16] = {0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1};
  (*mem) = (void*)( ((char*)(*mem)) + skip[((unsigned long long)(*mem)) & 15] );
  (*arr)=(T*)(*mem);
  (*mem)=((*arr)+x);
}
template<class T> inline void walloc1d(T **arr, int x1, int x2, void **mem = &wmem){
  walloc1d(arr, x2-x1, mem);
  (*arr) -= x1;
}
inline int my_getchar_unlocked(){
  static char buf[1048576];
  static int s = 1048576;
  static int e = 1048576;
  if(s == e && e == 1048576){
    e = fread_unlocked(buf, 1, 1048576, stdin);
    s = 0;
  }
  if(s == e){
    return EOF;
  }
  return buf[s++];
}
inline void rd(int &x){
  int k;
  int m=0;
  x=0;
  for(;;){
    k = my_getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = my_getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
inline void rd(char &c){
  int i;
  for(;;){
    i = my_getchar_unlocked();
    if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF){
      break;
    }
  }
  c = i;
}
inline int rd(char c[]){
  int i;
  int sz = 0;
  for(;;){
    i = my_getchar_unlocked();
    if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF){
      break;
    }
  }
  c[sz++] = i;
  for(;;){
    i = my_getchar_unlocked();
    if(i==' '||i=='\n'||i=='\r'||i=='\t'||i==EOF){
      break;
    }
    c[sz++] = i;
  }
  c[sz]='\0';
  return sz;
}
struct MY_WRITER{
  char buf[1048576];
  int s;
  int e;
  MY_WRITER(){
    s = 0;
    e = 1048576;
  }
  ~MY_WRITER(){
    if(s){
      fwrite_unlocked(buf, 1, s, stdout);
    }
  }
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked(int a){
  if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){
    fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);
    MY_WRITER_VAR.s = 0;
  }
  MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;
}
inline void wt_L(char a){
  my_putchar_unlocked(a);
}
inline void wt_L(int x){
  int s=0;
  int m=0;
  char f[10];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
inline void wt_L(unsigned x){
  int s=0;
  char f[10];
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
inline void wt_L(long long x){
  int s=0;
  int m=0;
  char f[20];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
inline void wt_L(unsigned long long x){
  int s=0;
  char f[21];
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
int WRITER_DOUBLE_DIGIT = 15;
inline int writerDigit_double(){
  return WRITER_DOUBLE_DIGIT;
}
inline void writerDigit_double(int d){
  WRITER_DOUBLE_DIGIT = d;
}
inline void wt_L(double x){
  const int d = WRITER_DOUBLE_DIGIT;
  int k;
  int r;
  double v;
  if(x!=x || (x==x+1 && x==2*x)){
    my_putchar_unlocked('E');
    my_putchar_unlocked('r');
    my_putchar_unlocked('r');
    return;
  }
  if(x < 0){
    my_putchar_unlocked('-');
    x = -x;
  }
  x += 0.5 * pow(0.1, d);
  r = 0;
  v = 1;
  while(x >= 10*v){
    v *= 10;
    r++;
  }
  while(r >= 0){
    r--;
    k = floor(x / v);
    if(k >= 10){
      k = 9;
    }
    if(k <= -1){
      k = 0;
    }
    x -= k * v;
    v *= 0.1;
    my_putchar_unlocked(k + '0');
  }
  if(d > 0){
    my_putchar_unlocked('.');
    v = 1;
    for(r=(0);r<(d);r++){
      v *= 0.1;
      k = floor(x / v);
      if(k >= 10){
        k = 9;
      }
      if(k <= -1){
        k = 0;
      }
      x -= k * v;
      my_putchar_unlocked(k + '0');
    }
  }
}
inline void wt_L(const char c[]){
  int i=0;
  for(i=0;c[i]!='\0';i++){
    my_putchar_unlocked(c[i]);
  }
}
inline void wt_L(string &x){
  int i=0;
  for(i=0;x[i]!='\0';i++){
    my_putchar_unlocked(x[i]);
  }
}
template<class T> struct Arr1d{
  int n;
  int mem;
  T*d;
  T& operator[](int a){
    return d[a];
  }
  void sort(){
    reset();
    std::sort(d, d+n);
  }
  int set_cumulative_sum;
  int cumulative_sum_mem;
  T*cumulative_sum;
  void setSum(void){
    int i;
    set_cumulative_sum = 1;
    if(cumulative_sum_mem < n+1){
      delete[] cumulative_sum;
      cumulative_sum = new T[n+1];
      cumulative_sum_mem = n+1;
    }
    cumulative_sum[0] = 0;
    for(i=(0);i<(n);i++){
      cumulative_sum[i+1] = cumulative_sum[i] + d[i];
    }
  }
  T getSum(int i, int j){
    if(set_cumulative_sum==0){
      setSum();
    }
    return cumulative_sum[j+1] - cumulative_sum[i];
  }
  void reset(){
    set_cumulative_sum = 0;
  }
  void constructor(){
    n = mem = 0;
    d = NULL;
    set_cumulative_sum = 0;
    cumulative_sum_mem = 0;
    cumulative_sum = NULL;
  }
  void destructor(){
    delete[] d;
    d = NULL;
    mem = n = 0;
    set_cumulative_sum = 0;
    cumulative_sum_mem = 0;
    delete[] cumulative_sum;
    cumulative_sum = NULL;
  }
  void constructor(int nn){
    constructor();
    malloc(nn);
  }
  void memory_expand(int nn){
    if(mem < nn){
      delete[] d;
      d = new T[nn];
      mem = nn;
    }
  }
  void malloc(int nn){
    reset();
    memory_expand(nn);
    n = nn;
  }
  void setN(int nn){
    reset();
    memory_expand(nn);
    n = nn;
  }
  void set(vector<T> &a){
    int i;
    int nn = a.size();
    setN(nn);
    for(i=(0);i<(nn);i++){
      d[i] = a[i];
    }
  }
  void set(int nn, T a[]){
    int i;
    setN(nn);
    for(i=(0);i<(nn);i++){
      d[i] = a[i];
    }
  }
  void free(){
    destructor();
  }
  Arr1d(){
    constructor();
  }
  Arr1d(int nn){
    constructor(nn);
  }
  ~Arr1d(){
    destructor();
  }
}
;
int N;
int Q;
int L;
int R;
int X;
char S[100000];
Arr1d<int> h[26];
int main(){
  int KrdatlYV, i;
  wmem = memarr;
  rd(N);
  rd(Q);
  rd(S);
  for(i=(0);i<(N);i++){
    S[i] -= 'a';
  }
  for(i=(0);i<(26);i++){
    h[i].setN(N);
  }
  for(i=(0);i<(26);i++){
    int j;
    for(j=(0);j<(N);j++){
      h[i][j] = 0;
    }
  }
  for(i=(0);i<(N);i++){
    h[S[i]][i] = 1;
  }
  for(KrdatlYV=(0);KrdatlYV<(Q);KrdatlYV++){
    rd(L);L += (-1);
    rd(R);R += (-1);
    rd(X);X += (-1);
    for(i=(0);i<(26);i++){
      X -= h[i].getSum(L,R);
      if(X < 0){
        wt_L((char)('a'+i));
        wt_L('\n');
        break;
      }
    }
  }
  return 0;
}
// cLay version 20210405-1

// --- original code ---
// int N, Q, L, R, X; char S[1d5];
// Arr1d<int> h[26];
// {
//   rd(N,Q,S);
//   rep(i,N) S[i] -= 'a';
//   rep(i,26) h[i].setN(N);
//   rep(i,26) rep(j,N) h[i][j] = 0;
//   rep(i,N) h[S[i]][i] = 1;
//   rep(Q){
//     rd(L--, R--, X--);
//     rep(i,26){
//       X -= h[i].getSum(L,R);
//       if(X < 0) Wt((char)('a'+i)), break;
//     }
//   }
// }