#include<iostream>
using namespace std;
bool obh(int koe)
{
    while(koe!=0)
    {
        int a=koe%10;
        if(a!=9&&a!=0) {return false;}
        koe /= 10; 
    }
    return true;
}
int main()
{
    long long a = 0,b = 0,ob = 0;
    long long otg = 0; 
    cin>>a>>b;
    ob = b;
    a=a+9-(a%9);
    for(int i = a; i <= b/2; i+=9)
    {
        otg ++;
    }
    b=b/2+9-((b/2)%9);
    for(int i = b; i <= ob; i+=9)
    {
        if(obh(i)) {otg ++;}
    }

    cout << otg << endl;
}