import java.util.*;
class Symmetric{
    Symmetric(int low , int high)
    {
        if(low < 0 || h<0)
        {
            System.out.print("Invalid input");
            return;
        }
        int count = 0;
        for(int i = low;i<=high;i++)
        {
            String nstr = String.valueOf(i);
            int len = nstr.length();
            if(len%2!=0)
            {
                continue;
            }
            int half = len / 2;
            int r =0;
            int l = 0;
            for(int j = 0; j<half;j++)
            {
                r += nstr.charAt(j)-'0';
            }
            for(int j = half ; j<len;j++)
            {
                r += nstr.charAt(j)-'0';
            }
            if(r==l)
            {
                count++;
            }
        }
        System.out.print(count);
    }
    
}
class Main{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        int l = sc.nextInt();
        int h = sc.nextInt();
        new Symmetric(l,h);
    
    }
}