#include <iostream>
#include <set>

int main(int argc, char *argv[]) {
  std::set<std::pair<std::string, std::string>> s;
  std::string c;
  std::cin >> c;
  int i = 1;
  while (i < (int)c.size()) {
    std::string a = c.substr(0, i), b = c.substr(i);
    ++i;
    if (a.at(0) == '0' || b.at(0) == '0')
      continue;
    s.insert({a, b});
  }

  std::cout << s.size() << std::endl;
}