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......
        String n = num +"";
        if(num>0){
            System.out.println(n.length());
        }else{
            System.out.println(num);
        }
        

    }
}