#include<stdio.h>
#include<iostream>
using namespace std;

string N;
int main (){
    cin >> N;
    int l = N.length() - 2;
    int ans = 0;
    if( 8 - l < 0) ans = ( 8 - l ) * -1;
    else ans = 8 - l;
    cout << ans  << endl;
    return 0;
}