s = 'ACDFACDFACDFACDFEEEEAAAAAAAAA'
f = [0] * len(s)
if s[0] in 'ACDF':
    f[0] = 1
else:
    f[0] = 0
for i in range(1, len(s)):
    if s[i] in 'ACDF':
        f[i] = f[i-1] + 1
    else:
        f[i] = 0
print(max(f))