#include<iostream>
#include<string>
#include<cstdio>
using namespace std;
int main()
{
long long a,b,br=0;
cin>>a>>b;
if(a%9!=0)a=a-a%9+9;
int x=0;
for(;a<=b;a=a+9)
{
int x=a,sum1=0,sum2=0;
while(x>0)
{
    sum1=sum1+x%10;
    x=x/10;
}
x=a*9;
while(x>0)
{
    sum2=sum2+x%10;
    x=x/10;
}
if(sum1==sum2){br++;
}
}
cout<<br<<endl;
return 0;
}
