S=input()
W=[0]*(len(S)+1)
for i in range(len(S)-1,-1,-1):
    if S[i]=="w":
        W[i]=W[i+1]+1
    else:
        W[i]=W[i+1]

ANS=0

for i in range(len(S)):
    if S[i]=="c":
        ANS+=(W[i]*(W[i]-1))//2

print(ANS)