#include<iostream>
using namespace std;
long long x;
long long namerisborotcifritena(long long chislo){
    long long sbor, deset;
    sbor=0;
    for(deset=10;deset<=chislo*10;deset=deset*10){
        sbor=sbor+((chislo%deset)/(deset/10));
    }
    return sbor;
}
int main(){
long long a, b, broqch, deset, normalensbor, devetichensbor, devetbroqch;
cin>>a>>b;
for(broqch=a;broqch<=b;broqch++){
    normalensbor=0;
    devetichensbor=0;
    normalensbor=namerisborotcifritena(broqch);
    if(normalensbor%9==0){
        devetbroqch=broqch*9;
        devetichensbor=namerisborotcifritena(devetbroqch);
        if(normalensbor==devetichensbor){
            x=x+1;
        }
    }
}
cout<<x<<endl;
return 0;
}