dem23.n24

import sys

f = open('24.txt')
s = f.readline()
f.close()

def d(x,y):
    global s
    s = s.replace(x,y)
x = 'CDF'
y = 'AO'
print(s[:20])
for i in x:
    d(i, 'X')
    print(s[:20])

for i in y:
    d(i,'Y')
    print(s[:20])


L = 1
R = len(s)
while L + 1 < R:
    M = (L + R) // 2
    if 'XY' * M in s:
        L = M
    else:
        R = M
print(L)