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

#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define rrep(i,m) for(int i=(int)(m)-1;i>=0;--i)
#define debug(x) cout << #x << "=" << (x) << endl;

template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return true;}return false;}
template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return true;}return false;}
template<typename T> void fail(T v){cout << v << endl;exit(0);}
//template end

void solve(){
  string s;
  cin>>s;
  vector<int> ct(s.size()+1);
  rrep(i,s.size())ct[i]=ct[i+1]+(s[i]=='w');
  ll res=0;
  rep(i,s.size())
    if(s[i]=='c')res+=(ll)ct[i]*(ct[i]-1)/2;
  cout<<res<<endl;
}

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  solve();
  return 0;
}