#include <bits/stdc++.h>
using namespace std;

signed main(){
  string S; cin >> S;
  vector< int > pcs( S.size() + 1 ), sws( S.size() + 1 );
  for( int i = 0; i < S.size(); ++i )
    pcs[ i + 1 ] = pcs[ i ] + ( S[ i ] == 'c' );
  for( int i = S.size() - 1; i >= 0; --i )
    sws[ S.size() - i ] = sws[ S.size() - i - 1 ] + ( S[ i ] == 'w' );
  long long ans = 0;
  for( int i = 0; i < S.size(); ++i )
    if( S[ i ] == 'c' )
      ans += 1LL * sws[ S.size() - i - 1 ] * ( sws[ S.size() - i - 1 ] - 1 ) / 2;
  cout << ans << endl;
  return 0;
}