#include <iostream>
#include <string>
using namespace std;
typedef long long ll;
int main()
{
  ios::sync_with_stdio( false );
  string s;
  cin >> s;
  ll n = 0;
  ll ret = 0;
  for( int i=s.size()-1; i>=0; i-- ){
    if( s[i] == 'w' ) {
      n++;
    } else if( s[i] == 'c' ) {
      ret += n * (n-1) / 2;
    }
  }
  cout << ret << endl;
}