#coding: UTF-8

import sys
import re
import itertools
from collections import deque

### defs ###
def cww(s):
	sz = len(s)
	cnt=0
	for c in s:
		if (cnt==0 and c=='c'):
			cnt+=1
		elif (cnt==1 and c=='w'):
			cnt+=1
		elif (cnt==2 and c=='w'):
			cnt+=1
	if(cnt==3):
		res=sz
	else:
		res=-1
	return res

### main ###
s = sys.stdin.readline()
ans = -1
sz = len(s)
for i in range(sz):
	for j in range(i+1,sz+1):
		l = cww(s[i:j])
		if (l > 0):
			if(ans < 0):
				ans = l
			else:
				ans = min(ans,l)
print (ans)