#include <iostream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <algorithm>
using namespace std;

long long fact(long long n){long long i,j;for(i=1ll,j=1ll;i<n;j*=i)i++;return j;}
long long combi(long long x,long long k){return fact(x)/(fact(k)*fact(x-k));}

int main(){
    char c;
    long long i,w,j,n;
    int s[100050];
    
    i=0;
    while(cin>>c){
        s[i++]=(int)c;
        if (c=='w') w+=1;
    }
    n=0;
    for (j=0;j<i;j++){
        if (w<=1) break;
        if (s[j]=='c') n+=combi(w,2);
        if (s[j]=='w') w-=1;
    }
    
    cout<<n<<endl;
    return 0;
}