import java.util.Scanner;
public class Main { public static void main(String[] args) { Scanner scan = new Scanner(System.in); int num = scan.nextInt(); scan.close();
//write code here......
if (num<=0){
System.out.println(num);
}
else {
String str = String.valueOf(num);
char[] chars = str.toCharArray();
int count = chars.length;
if(chars[0]=='0'){
count--;
}
System.out.println(count);
}
}
}