Hacking hashes

from itertools import product
import random
import string
def F(s):
    h = 0
    for c in s:
        h = (h * A + c) % B
    return h

def FF(s):
    h = 0
    for c in s:
        h = (h * A + ord(c)) % B
    return h

def FFF(s):
    h = (s[0] * AAAA + s[1] * AAA + s[2] * AA + s[1] * A + s[2]) % B
    return h

def num_to_s(x):
    s = ''
    for i in x:
        s += chr(i)
    return s


A, B = map(int, input().split())
AA = (A ** 2)% B
AAA = (AA * A) % B
AAAA = (AA ** 2) % B
# for x in range(0, 26):
#     for y in range(0, 26):
#         for z in range(-25, 26):
#             if F([x, y, z]) == 0 and (x != 0 or y != 0 or z != 0):
#                 print(x, y, z)
#                 s1 = ''
#                 s2 = ''
#                 for i in [x, y, z]:
#                     p, q = num_to_c(i)
#                     s1 += p
#                     s2 += q
#                 print(s1[::-1], s2[::-1])
#                 print(FF(s1[::-1]), FF(s2[::-1]))
h2s = dict()
hs = set()
while True:
    s = ''.join(random.choices(string.ascii_lowercase, k=7))
    h = FF(s)
    # print(h)
    if h in hs and h2s[h] != s:
        print(s, h2s[h])
        break
    hs.add(h)
    h2s[h] = s

Test 1

Verdict: ACCEPTED

Test 2

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Test 3

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Test 89

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Test 90

Verdict: ACCEPTED