24 соседние различные

#https://inf-ege.sdamgia.ru/problem?id=27421
s = open('24_demo.txt').readline()
answ = 1
cnt = 1 #длина тек строки
for i in range(1, len(s)):
    if s[i] != s[i - 1]:
        cnt += 1
        answ = max(answ, cnt)
    else:
        cnt = 1
print(answ)