#include <iostream>
#include <string>
using namespace std;
//4STEP 数学1+AのP.100参照

int main(){
   string s;
   cin >> s;
   int ans = 0,count = 0;
   for(int i = s.size() - 1;i != 0;i--){
      if(s[i] == 'w') count++;
      if(s[i] == 'c') ans += count * (count - 1) / 2;
   }
   cout << ans << endl;
}