#include<bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
int main(){
	string S;
        cin>>S;
	int w_num=0;
	REP(i,S.size()){
	    if(S[i]=='w')w_num++;
	}
	int prev_w=0;
	int prev_c=0;
	long long ans=0;
	REP(i,S.size()){
	    if(S[i]=='c')prev_c++;
	    if(S[i]=='w'){
	       prev_w++;
	       ans+=(w_num-prev_w)*prev_c;
	    }
	}
        cout<<ans<<endl;
	return(0);
}