s = 'AAAAAAAAAAAAAAAAFHFHFHFHFHF' + 'B' * 16 + 'A' * 16
f = [1] * len(s)
Pov = []
for i in range(1, len(s)):
    if s[i] == s[i-1]:
        f[i] = f[i-1] + 1
    else:
        f[i] = 1
    if f[i] == 16:
        Pov.append(s[i])
print(Pov[0])
print(max(f))