#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>
ll onepref(ll k){
if(!k)return 1;
ll re = 9;
k--;
while(k--)re *= 8;
return re;
}
ll twopref(ll k){
if(!k)return 1;
ll re = 1;
while(k--)re *= 8;
return re;
}
ll allzero(ll k){
ll re = 0;
ll tmp = 1;
if(!k)return 0;
else if(k == 1)return 10;
else if(k == 2)return 91;
tmp = 9*9;
k-= 2;
re = 91;
while(k--){
tmp *= 8;
re += tmp;
}
return re;
}
ll f(ll k){
if(k <= 0)return 0;
string s = to_string(k);
int b = s.size();
ll re = allzero(b-1);
re += onepref(b-1)*(s[0]-'0'-1);
for(int i = 1;i<b;i++){
for(int j = 0;j<s[i]-'0';j++){
if(j != s[i-1]-'0'&&(i-2<0||j != s[i-2]-'0'))re += twopref(b-1-i);
}
if((i-1>=0&&s[i] == s[i-1])||(i-2>=0&&s[i] == s[i-2])){
break;
}
}
return re;
}
int main(){
ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
ll a,b;
cin>>a>>b;
//cout<<b+1<<":"<<f(b+1)<<' '<<a<<":"<<f(a)<<endl;
cout<<f(b+1)-f(a);
}
