#include <stdio.h>


int main(void) {


	char s;

	int c = 0,w = 0;


	while ((s = getchar()) != '\n') {

		if (s == 'c') c++;

		else if (s == 'w') w++;

	}


	if (c <= w) printf("%d\n", c - 1);

	else printf("%d\n", w);


	return 0;

}