#include <stdio.h>

int main() {
	char s;
	int cntc = 0, cntw = 0;

	while ((s = getchar()) != '\n') {
		if (s == 'c') cntc++;
		else if (s == 'w') cntw++;
	}

	if (cntc <= cntw) printf("%d\n", cntc - 1);
	else printf("%d\n", cntw);
	return 0;
}