class INPUT:
  def __init__(self):
    self.l=open(0).read().split()[::-1]
    self.length=len(self.l)
    return

  def stream(self,k=1,f=int,f2=False):
    assert(-1<k)
    m=self.length
    if m==0 or m<k:
      raise Exception("There is no input!")
    elif f!=str:
      if k==0:
        self.length=0
        return list(map(f,self.l[::-1]))
      if k==1 and not f2:
        self.length-=1
        return f(self.l.pop())
      if k==1 and f2:
        self.length-=1
        return [f(self.l.pop())]
      ret=[]
      for _ in [0]*k:
        ret.append(f(self.l.pop()))
      self.length-=k
      return ret
    else:
      if k==0:
        self.length=0
        return self.l[::-1]
      if k==1 and not f2:
        self.length-=1
        return self.l.pop()
      if k==1 and f2:
        self.length-=1
        return [self.l.pop()]
      ret=[]
      for _ in [0]*k:
        ret.append(self.l.pop())
      self.length-=k
      return ret
pin=INPUT().stream

"""
pin(number[default:1],f[default:int],f2[default:False])
if number==0 -> return left all
listを変数で受け取るとき、必ずlistをTrueにすること。
"""
from sys import stderr
from copy import copy
we=stderr.write
def main():
  N,Q=pin(2)
  S=list(pin(1,str))
  d=[]
  a=[0]*26
  d.append(copy(a))
  for i in S:
    a[ord(i)-97]+=1
    d.append(copy(a))
  for _ in [0]*Q:
    L,R,X=pin(3)
    #print(d[R],d[L-1])
    db=[]
    for i in range(26):
      t=d[R][i]-d[L-1][i]
      db.append(t)
      X-=t
      if X<=0:
        print(chr(97+i))
        break
  return
main()