n,q = map(int,input().split())
s = input()
lrx = [[int(i)-1 for i in input().split()] for j in range(q)]

#sli = np.zeros(n)
sli = [0]*(n)

for i in range(n):
    sli[i] = ord(s[i])

for i in range(q):
    l,r,x = lrx[i][0],lrx[i][1],lrx[i][2]
    #li = np.copy(sli[l:r+1])
    #li = sli[l:r+1]
    tmp = [0]*26
    for j in range(r-l+1):
        tmp[ord(s[l+j])-ord("a")] += 1
        #print(l+j,"lj")
    
    cnt = 0
    #print(tmp,cnt,x)
    for j in range(26):
        cnt += tmp[j]
        if cnt > x:
            print(chr(ord("a")+j))
            break

    #tmp = tmp[l:r+1]
    #print(tmp)
    #for j in range(r-l+1):
    #    tmp.append(sli[l+j])
    #tmp.sort()
    #tmp = np.sort(tmp)
    #print(chr(int(tmp[x])))
    #print(tmp,x,sli)