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

long long combi(long long n, long long r){
    long long i;
    long long p=1;

    for (i=1;i<=r;i++)
        p=p*(n-i+1)/i;
    return p;
}

int main(){
    char c;
    long long i,j;
    long long n,w;
    long long s[100050];
    
    i=0;w=0;
    while(cin>>c){
        s[i++]=(long long)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;
}