s = input()

c = 0
w = 0
for ch in s:
    if ch == 'c':
        c += 1   
    elif ch == 'w':
        w += 1

if c < 2:
    print("0")
elif w < 1:
    print("0")
elif w < c - 1:
    print(w)
else:
    print(c - 1)