#include<stdio.h>
int main(void){
	char s[100000];
	int i = 0, cCnt = 0, wCnt = 0;
	scanf("%s", &s);
	while(s[i] != 0){
		if(s[i] == 'c'){
			cCnt++;
		}else{
			wCnt++;
		}
		i++;
	}
	if(cCnt > wCnt){
		printf("%d\n", wCnt);
	}else if(cCnt <= wCnt){
		printf("%d\n", cCnt-1);
	}
	return 0;
}