#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define rrep(i, a, b) for(int i = a; i >= b; i--)
#define fore(i, a) for(auto &i:a)
#define print(x) cout << x << "\n"
#define SORT(a, n) sort(a, a+n);
#define REVERSE(a,n) reverse(a,a+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VREVERSE(v) reverse(v.begin(), v.end());
#define MOD 1000000007
#define yes "YES"
#define no "NO"
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;

ll w[100001];
int main() {
    fastcin;
    string s;
    cin >> s;
    ll ans = 0;
    int len = s.length();
    rrep(i, len-1, 0) {
        w[i] = w[i+1];
        if(s[i]=='w') {
            w[i]++;
        }
    }
    rep(i, 0, len) {
        if(s[i]=='c') {
            ans += w[i]*(w[i]-1)/2;
        }
    }
    printf("%lld\n", ans);
    return 0;
}