#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int mod = 1e9 + 7;
const int inf = (1 << 30) - 1;
const ll infll = (1LL << 61) - 1;

string s;

int main()
{
    cin >> s;
    int N = s.size() - 3;
    cout << abs(7 - N) << "\n";
}