first_s = input();
first_len = len(first_s)
right_len = first_len
left_c =0
right_c =0
result=0

for lef_n in range(first_len-1):
	right_len = right_len-1
	if first_s[lef_n]==first_s[lef_n+1] and first_s[lef_n]=="c":
		left_c= left_c+1

	if first_s[right_len]==first_s[right_len-1] and first_s[right_len]=="w":
		right_c= right_c+1
	elif first_s[right_len]!=first_s[right_len-1] and first_s[right_len]=="w":
		right_c= right_c+1


if left_c > right_c:
	result =right_c
else:
	result =left_c

print(result)