#include <iostream>
using namespace std;
int main()
{
long long a,b,br=0;
cin>>a>>b;
for(long long i=a;i<=b;i++)
{
long long m=i,sb=0,sb2=0;
while(m)
{
    sb=m%10+sb;
    m/=10;
}
m=i*9;
while(m)
{
    sb2=m%10+sb2;
    m/=10;
}
if (sb==sb2) br++;
}
cout<<br<<endl;
return 0;
}