#include <stdio.h>
#include <string.h>

void main(void){
	char checkStr[100] = "a";
	const int RequiredCount = 8;
	scanf("%s",checkStr);
	int count = 0;
	for(int i = 1 ; i < (int)strlen(checkStr)-1;i++){
		count++;
	}
	int ans = count - RequiredCount;
	if(ans < 0){
		ans *= -1;
	}
	printf("%d\n",ans);
}