import sequtils,strutils
var
    S = stdin.readline
    cntw,cntc,cnt : int

for s in 1..S.len:
    if S[^s] == 'c':
        cntc += 1
        cnt += cntw * (cntw - 1) div 2
    elif S[^s] == 'w':
        cntw += 1

echo cnt