import java.util.*;public class Main{    public static void main(String[] args){        Scanner sc = new Scanner(System.in);        String str = sc.nextLine();        String[] num = str.split(" ");        String s1 = num[0];        int s11 = Integer.parseInt(s1);        String s2 = num[1];        int s22 = Integer.parseInt(s2);        int sum=0;        for(int i = s11;i<s22;i++){            String t = String.valueOf(s11);            if(t.charAt(0)=='0'||t.charAt(2)=='0'||t.charAt(4)=='0'){                continue;            }           int num1 = Integer.parseInt(t.substring(0,2));                       int num2 = Integer.parseInt(t.substring(2,4));                       int num3 = Integer.parseInt(t.substring(4,6));            if(num1+num2 == num3){                sum +=1;            }        }        System.out.println(   );    }}