#include<iostream>
using namespace std;
int main()
{
long long a,b,br=0,i;
cin>>a>>b;
a=a+9-(a%9);
b=b-b%9;
for(i=a;i<=b;i+=9)
{
long long x,x9,s=0,s1=0;
x=i;
x9=i*9;
while(x!=0)
{
s+=x%10;
x/=10;
}
while(x9!=0)
{
s1+=x9%10;
x9/=10;
}
if(s==s1)br++;
}
cout<<br<<endl;
return 0;
}