# 24(28) РТ

f = open(r"C:\Users\SnowDrit\Downloads\24\24.28.txt")
s = f.readline()
a = s.split('C')
t= []
for i in range(len(a)-1):
    t.append(a[i] + 'C' + a[i+1])
print(len(max(t,key = len)))
# 24(28) РТ