package yukicoder;
import java.util.*;
public class Main{
	public static void main(String[] args)throws Exception{
		new Main().solve();
	}
	void solve(){
		Scanner sc=new Scanner(System.in);
		String str=sc.next();
		long m=0;
		long ans=0;
		for(int i=str.length()-1;i>=0;i--){
			if(str.charAt(i)=='w')m++;
			else if(str.charAt(i)=='c')ans+=combination(m);
		}
		System.out.println(ans);
		sc.close();
	}
	//nC2
	long combination(long n){
		return (n*(n-1))/2;
	}
}