#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;
const int MOD = INF + 7;

int main() {
    string s;
    cin >> s;

    cout << abs(int(s.size() - 2 - 8)) << endl;

    return 0;
}