s = input()
s += 'x'
l = []
count = 0
temp = ''
max = 0
for i in range(len(s)):
  count = 0
  temp = ''
  if s[i] == 'c' and not s[i + 1] == 'c':
    temp += 'c'
    for j in range(i+1, len(s)):
      if temp[-1] == 'c' and s[j] == 'c':
        break
      else:
        temp += s[j]
        if s[j] == 'w':
          count += 1

        if count == 2:
          break
    l.append(temp)

for i in l:
  if i.count('w') == 2 and len(i) > max:
    max = len(i)

if max:
  print(max)
else:
  print(-1)