s = input()
a = []
c = 0
d = 0

for value in range(0,2):
    a.append(s)

while ('ccw' in a[0]) == True:
    a[0] = a[0].replace('c','',1)
    c = c + 1

while ('ccw' in a[1]) == True:
    a[1] = a[1].replace('w','',1)
    d = d + 1

if c >= d:
    print(d)
else:
    print(c)