#include <algorithm>
#include <cmath>
#include <cstring>
#include <deque>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <string>
#include <unordered_map>
#include <vector>

using namespace std;
using ll = long long;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    string s1 = "1000000007";
    string s2;
    cin >> s2;

    cout << abs((int)s1.length() - (int)s2.length()) << endl;

    return 0;
}