#include <bits/stdc++.h>


int main(){
  std::string s;
  while(std::cin >> s){
    int ans = 0;

    int N = (int)s.size();
    for(int i = 1; i < N; ++i){
      auto a = s.substr(0, i);
      auto b = s.substr(i, N);

      if(b[0] != '0') ++ans;
      //std::cerr << a << " " << b << "\n";
    }
    
    std::cout << ans << "\n";
  }

  return 0;
}