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 a = num + "a";
        System.out.println(a.length()-1);
    }


}

}