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

void main(void){
	char checkStr[100] = "a";
	const int RequiredCount = 10;
	scanf("%s",checkStr);
	
	int ans = (int)strlen(checkStr) - RequiredCount;
	if(ans < 0){
		ans *= -1;
	}
	
	printf("%d\n",ans);
}