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 s = ((Integer)num).toString();
        System.out.println(s.length());
    }
    

}

}