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

          temp += s[j]

          if s[j] == 'w':
            count += 1

          if count == 2:
            break
        l.append(temp)
    else:
      for j in range(i, len(s)):

        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)