f=open('24.txt')

s=f.read()

maxi=0

c=0

i=0

while i < len(s)-2:

if s[i] in "AO" and s[i+1] in 'AO' and s[i+2] in 'CDF' :

c+=1

maxi=max(maxi,c)

i+=3

else:

c=0

i+=1

print(maxi)