24 паттерн с ифами покороче

s = open('').readline()
d = 0
answ = 0
for i in range(len(s)):
    if (d != 0) and (s[i - 1] + s[i] in ['XY', 'YZ', 'ZX']):
        d += 1
        answ = max(answ, d)
    elif s[i] == 'X':
        d = 1
    else:
        d = 0
print(answ)