#include <iostream>
using namespace std;
int main()
{long long a,b;
 int c=0,d,s1,s2;
 long long t,i,i9;
 cin>>a>>b;
 //   a,   9
 if (a%9!=0) a=9*(a/9+1);
 s1=s2=0;
 i=t=a;
 //    i
 while (t!=0)
 {s1=s1+t%10;
  t=t/10;
 }
 i9=t=9*a;//i9   i
 //    i9
 while (t!=0)
 {s2=s2+t%10;
  t=t/10;
 }
 if (a<=b)//     a 
          //   9  ,   a<=b
  do
  {if (s1==s2) c++;//    - 
   //   s1
   if (i%10==0) s1=s1+9;
   else
   {t=i/10;
    while(t%10==9){s1=s1-9;t=t/10;}
   }
   //   s2
   if (i9%10==9) s2=s2-9;
   if (i9%100<19) s2=s2+9;
   else
   {t=i9/100;
    while (t%10==9) {s2=s2-9;t=t/10;}
   }
   i=i+9;//  
   if (i>b) break;
   i9=i9+81;
  }while (true);
 cout<<c<<endl;
}
