#include <cstdio>
#include <cstring>

using namespace std;

char s[111111];

int main(void) {
  int w = 0;
  scanf("%s", s);
  int l = strlen(s);
  long long res = 0;
  for (int i = l-1; i >= 0; i--) {
    if (s[i] == 'w') w += 1;
    if (s[i] == 'c') {
      res += w*(w-1ll)/2;
    }
  }
  printf("%lld\n", res);
  return 0;
}