n, q = map(int, input().split())
s = input()
lis = [[0] * (n + 1) for i in range(26)]
for i in range(n):
    num = ord(s[i]) - ord("a")
    lis[num][i + 1] += 1
for i in range(26):
    for j in range(1, n + 1):
        lis[i][j] += lis[i][j - 1]
for _ in range(q):
    l, r, x = map(int, input().split())
    cnt = [lis[i][r] - lis[i][l - 1] for i in range(26)]
    for i in range(26):
        if x - cnt[i] <= 0:
            print(chr(ord("a") + i))
            break
        x -= cnt[i]