#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  string s;
  cin>>s;
  reverse(s.begin(),s.end());
  auto calc=[](Int x){return x*(x-1)/2;};
  Int ans=0,cnt=0;
  for(char c:s){
    if(c=='w') cnt++;
    if(c=='c') ans+=calc(cnt);
  }
  cout<<ans<<endl;
  return 0;
}