#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define eb emplace_back
#define ll long long
#define pll pair<ll,ll>
#define ff first
#define ss second
//#define endl "\n"
const ll maxn=1e6+50;
const ll mod =998244353 ;
const ll base=3e18;
ll dp[50][20][20][5][5];
ll b[maxn];
ll cnt1;
ll dem(ll p)
{
ll cnt=0;
while (p)
{
cnt++;
p/=10;
}
return cnt;
}
ll dem1=0;
ll dosth(ll id,ll nw1,ll nw2,ll h,ll dd)
{
if (dp[id][nw1][nw2][h][dd]!=-1)
{
return dp[id][nw1][nw2][h][dd];
}
if (id==cnt1) return dp[id][nw1][nw2][h][dd]=1;
ll t=0;
if (dd==0)
{
t=t+dosth(id+1,10,10,1,0);
}
for (int i=0;i<=9;i++)
{
if (dd==0&&i==0) continue;
if (!h&&b[id+1]<i) continue;
if (i==nw1||i==nw2) continue;
t=t+dosth(id+1,nw2,i,h|(b[id+1]>i),1);
}
return dp[id][nw1][nw2][h][dd]=t;
}
ll cntpp(ll a)
{
if (a<0) return 0;
cnt1 =dem(a);
ll h= cnt1;
memset(dp,-1,sizeof(dp));
while (a)
{
b[h]=(a%10);
a/=10;
h--;
}
/*for (int i=1;i<=cnt1;i++)
{
cout <<b[i]<<endl;
}*/
return dosth(0,10,10,0,0);
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
/*if (fopen("p.inp", "r"))
{
freopen("test.inp", "r", stdin);
freopen("test.out", "w", stdout);
}*/
ll a, b;
cin>> a>> b;
cout <<cntpp(b)-cntpp(a-1);
// cout <<cntpp(a)<<endl;
}
