#include<stdio.h>
#include<stdlib.h>
int main(void){
    
    int N,ans;
    scanf("%d",&N);
    if(N<100||N>1000000000000000){ return 0; }
    
    while(N!=0){
        N=N/10;
        ans++;
    }
    ans=ans-2;
    printf("%d\n",abs(ans-8));
}