import sys
input = sys.stdin.readline
N, Q = map(int, input().split())
S = list(map(lambda c: ord(c) - ord("a"), list(input())[: -1]))

cs = [[0] * (N + 1) for _ in range(26)]
for i in range(26):
  for j in range(N): cs[i][j + 1] = cs[i][j] + (S[j] == i)

for _ in range(Q):
  l, r, x = map(int, input().split())
  for i in range(26):
    c = cs[i][r] - cs[i][l - 1]
    x -= c
    if x <= 0:
      print(chr(i + ord("a")))
      break