/* ---------- STL Libraries ---------- */
// IO library
#include <cstdio>
#include <fstream>
#include <iomanip>
#include <ios>
#include <iostream>

// algorithm library
#include <algorithm>
#include <cmath>
#include <numeric>
#include <random>
#include <cstring>

// container library
#include <array>
#include <bitset>
#include <deque>
#include <map>
#include <unordered_map>
#include <queue>
#include <set>
#include <string>
#include <tuple>
#include <vector>
#include <stack>

/* ---------- Namespace ---------- */
using namespace std;

/* ---------- Type ---------- */
using ll = long long;
#define int ll
#define P pair<ll, ll>

/* ---------- Constants  */
const double PI = 3.141592653589793238462643383279;
const ll MOD = 1e9 + 7;
const int INF = 1LL << 55;

/* v-v-v-v-v-v-v-v-v Main Part v-v-v-v-v-v-v-v-v */
signed main() {
    string str;
    cin >> str;

    if (str.size() < 2) {
        cout << -1 << endl;
    }

    if (str[0] != '0' + 1) {
        cout << -1 << endl;
        return 0;
    }

    for (int i = 1; i < str.size(); i++) {
        if (str[i] != '0' + 3) {
            cout << -1 << endl;
            return 0;
        }
    }

    cout << str.size() - 1 << endl;
    return 0;
}