#include <stdio.h>
#include <string.h>
#define rrep(i, n) for (i = n; i >= 0; i--)

int main() {
	static char s[100000];
	scanf("%s", s);

	int i, w = 0, ans = 0;
	rrep(i, strlen(s)) {
		if (s[i] == 'w') w++;
		if (s[i] == 'c') ans += (w - 1) * w / 2;
	}

	printf("%d\n", ans);
	return 0;
}