//inlclude前用define 
#define _USE_MATH_DEFINES

//include
#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<cmath>

using namespace std;
//typedef
typedef vector<int> VI;
typedef vector<string> VS;
typedef vector<char> VC;

int main() {
	string s;
	cin >> s;
	int size = s.size();
	int cnt = 8;
	cout << abs((size - 2) - cnt) << endl;
}