S=list(input())
C=[]
if S[0]=="c":
    C.append(1)
else:
    C.append(0)

for i in range(1,len(S)):
    if S[i]=="c":
        C.append(C[-1]+1)
    else:
        C.append(C[-1])
        
s=S[::-1]
W=[]
if s[0]=="w":
    W.append(1)
else:
    W.append(0)

for i in range(1,len(S)):
    if s[i]=="w":
        W.append(W[-1]+1)
    else:
        W.append(W[-1])
W=W[::-1]
#print(S)
#print(C)
#print(W)
ans=0
for i in range(1,len(S)-1):
    if S[i]=="w":
        ans+=C[i]*(W[i]-1)
print(ans)