s = input()
l = []
count = 0
temp = ''
max = 0
for i in range(len(s)):
  count = 0
  temp = ''
  if s[i] == 'c':
    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 not i[1] == 'c' and i.count('w') == 2 and len(i) > max:
    max = len(i)

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