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