from collections import defaultdict
n,m = map(int,input().split())
s = list(map(str,input()))
ss = sorted(s)
d = defaultdict(list)
for i in range(n):
    d[s[i]].append(i+1)

dd = sorted(d.items())
for _ in range(m):
    a,b,c = map(int,input().split())
    cnt = 0
    flag = False
    for key,lis in dd:
        for v in lis:
            if(a <= v <= b):
                cnt += 1
            if(cnt == c):
                print(key)
                flag = True
                break
        if(flag):
            break