#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <tuple>
using namespace std;

#define YES(condition) if(condition){ cout << "YES" << endl; }else{ cout << "NO" << endl; }
#define Yes(condition) if(condition){ cout << "Yes" << endl; }else{ cout << "No" << endl; }
#define Poss(condition) if(condition){ cout << "Possible" << endl; }else{ cout << "Impossible" << endl; }

int main(){
    string N;
    cin >> N;
    cout << abs(int(N.size() - 10)) << endl;
}