#include <bits/stdc++.h>
#ifdef _DEBUG
#include "debug.hpp"
#else
#define debug(...)
#endif
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define precise(i) fixed << setprecision(i)
using ill = int64_t;
using ull = uint64_t;
using namespace std;

void solve() {
  string s;
  cin >> s;

  bool isValid = true;

  if (s.front() != '1') {
    isValid = false;
  }

  for (size_t i = 1; i < s.size(); i++) {
    if (s[i] != '3')
      isValid = false;
  }

  if (isValid && s.size() > 1)
    cout << (int)s.size() - 1 << '\n';
  else
    cout << "-1" << '\n';
}

void wrapper() {
  rep(i, 2) {
    cout << "[TEST " << i << "]\n";
    solve();
    cout << "\n";
  }
}

int main() {
  fastIO;
#ifdef _DEBUG
  wrapper();
#else
  solve();
#endif
}