#include<iostream>
#include<cmath>
#include<cstdio>
#include<string>
#include<stack>
#include<algorithm>
using namespace std;
long long a,b,i,i0,i1,i11,sum1,sum2,ans;
int main()
{
   cin>>a>>b;
   for(i=a; i<=b; i++)
   {
      i1=i*9;
      i0=i;
      i11=i1;
      for(;;)
      {
         if(i11==0) break;
         if(i11%10==0) i11/=10;
         sum1+=i11%10;
         if(i0>0)sum2+=i0%10;
         i0/=10;
         i11/=10;
      }
      if(sum1==sum2) ans++;
      sum1=0;
      sum2=0;
   }
   cout<<ans<<endl;
   return 0;
}