#include <stdio.h>

char s[100001];
long long int w[100001], ans;

int main(void) {
	scanf("%s", s);
	
	int i = 0, p = 0;
	while(s[i] != '\0') {
		if(s[i] == 'c') { p++; }
		if(s[i] == 'w') { w[p]++; }
		i++;
	}
	
	while(p > 0) {
		w[p] += w[p + 1];
		ans += w[p] * (w[p] - 1) / 2;
		p--;
	}
	
	printf("%lld\n", ans);
	
	return 0;
}