// editor2
import java.util.Scanner;
class Main{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        
        int low=sc.nextInt();
        int high=sc.nextInt();
        if(low < 0 || high < 0){
            System.out.println("Invalid input");
            return;
        }
        
        int count=0;
        for(int j=low;j<=high;j++){
            String s=String.valueOf(j);
            int len=s.length();
            if(len%2==0){
                int mid=len/2;
                int leftsum=0;
                int rightsum=0;
            
            for(int i=0;i<mid;i++){
                leftsum += s.charAt(i)- '0';
            }
            for(int i=mid;i<length;i++){
                rightsum += s.charAt(i)- '0';
            }
            if(leftsum==rightsum){
                count++;
            }
        }
    }
        System.out.println(count);
    }
}