s = input()
w=0
start = 0
candid = []

for i in range(len(s)):
    if s[i]=="c":
        start=i
        for j in range(i,len(s)):
            if s[j] =="w":
                w+=1
                if w==2:
                    candid.append(j-i+1)
                    w=0
                    break

print(min(candid))