#include<iostream>
#include<vector>
#include<algorithm>
#include<math.h>
#include<string>
using namespace std;


int main(){
  string cww;
  cin >> cww;
  long long count=0;
  vector<long long> cwwCnt(cww.size());
  if(cww[cww.size()-1]=='w')cwwCnt[cww.size()-1]=1;
  else cwwCnt[cww.size()-1]=0;
  for(int i=cww.size()-2;i>=0;i--){
    if(cww[i]=='w')cwwCnt[i]=1+cwwCnt[i+1];
    else cwwCnt[i]=cwwCnt[i+1];
    if(cww[i]=='c'){
      count+=(cwwCnt[i]*(cwwCnt[i]-1))/2;
    }
  }
  cout << count <<endl;
  return 0;
}