def cipher(a, b, s):
    ans = ""
    for c in s:
        m = ord(c) - ord('A')
        p = (a * m + b) % 26
        l = chr(65 + p)
        ans += l
    return ans
    
def decode(s):
    ans = ""
    for c in s:
        m = ord(c) - ord('A')
        p = (3 * m + 11) % 26
        l = chr(65 + p)
        ans += l
    return ans

m1 = 'JFUQLPEKPCUPL'

# Message secret :  x => 11 x + 3
m2 = 'UVQQPNKDQTZVFBQKVZVTEXPVUVTNKNBETTBQETPITKVPWVEUVTRVQTTVQTVTMUVNQTKVKBPEVT'











ans = "LENNUIDANSCEMONDECESTQUELESIDIOTSSONTSURSDEUXETLESGENSSENSESPLEINSDEDOUTES"
print(cipher(11, 3, ans))
f=lambda a,b,s:''.join(chr(65+(a*(ord(c)-65)+b)%26)for c in s)
print(f(19,21,m2))