#include <stdio.h>

int main(void) {
	char s;
	int c = 0;
	int w = 0;
	while(scanf("%c", &s) != EOF){
		//printf("%c", s);
		if(s == 'c')c++;
		if(s == 'w')w++;
	}
	//printf("c:%d, w:%d\n", c, w);
	c = c - 1;
	if( c < w)printf("%d\n", c);
	else      printf("%d\n", w);
	
	return 0;
}