#include "bits/stdc++.h"
using namespace std;
string Actual;
vector< vector< vector< vector< vector<long long> > > > > PD;
long long Resolver(long long Anterior_anterior, long long Anterior, long long i, long long Libre, long long Primero){
if(i == Actual.size()) return 1;
if(PD[Anterior_anterior][Anterior][i][Libre][Primero] != -2) return PD[Anterior_anterior][Anterior][i][Libre][Primero];
long long r = -0;
if(Libre == 1){
for(long long j = Primero; j < 10; j++){
if(j != Anterior_anterior and j != Anterior) r += Resolver(Anterior, j, i + 1, 1, 0);
}
} else {
for(long long j = Primero; j <= Actual[i] - '0'; j++){
if(j != Anterior_anterior and j != Anterior) r += Resolver(Anterior, j, i + 1, (long long)(j != Actual[i] - '0'), 0);
}
}
return PD[Anterior_anterior][Anterior][i][Libre][Primero] = r;
}
long long Resolviendo(long long n){
if(n < 0) return 0;
if(n == 0) return 1;
stringstream a;
a<<n;
a>>Actual;
PD.assign(11, vector< vector< vector< vector<long long> > > >(11, vector< vector< vector<long long> > >(Actual.size(), vector< vector<long long> >(2, vector<long long>(2, -2)))));
long long r = Resolver(10, 10, 0, 0, 1);
for(long long i = 1; i <= Actual.size(); i++){
r += Resolver(10, 10, i, 1, 1);
}
return r;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
long long a, b;
cin>>a>>b;
cout<<Resolviendo(b) - Resolviendo(a - 1);
/*if(b - a > 222222) cout<<Resolviendo(b) - Resolviendo(a - 1);
else {
long long c = 0;
for(long long i = a; i <= b; i++){
long long j = i;
stringstream zd;
zd<<j;
string Hola;
zd>>Hola;
bool Bien = 1;
for(j = 0; j < Hola.size() - 1; j++){
if(Hola[j] == Hola[j + 1]){
Bien = 0;
break;
}
}
for(j = 0; j < Hola.size() - 2; j++){
if(Hola[j] == Hola[j + 2]){
Bien = 0;
break;
}
}
c += Bien;
}
cout<<c;
}*/
return 0;
}
