#include<bits/stdc++.h>
#define int long long
#define double long double
#define PB push_back
#define maxn 100007
#define bit(x,i) ((x>>i)&1)
#define S second
#define F first
#define MP make_pair
#define epsilon 0.000001
using namespace std;
typedef pair<int,int> pii;
typedef pair<double,double> pdd;
const int inf = 1e18;
const int mod = 1e9+7;
const double PI = acos(-1);
int l,r,f[19][2][11][11][2];
void readData(){
cin>>l>>r;
}
int dp(string s, int id, int smaller, int t1, int t2, int st){
if (id==s.size()) return 1ll;
if (f[id][smaller][t1][t2][st]!=-1) return f[id][smaller][t1][t2][st];
int limit,res=0;
if (smaller) limit=9;
else limit=s[id]-'0';
for (int i=0;i<=limit;i++){
if (st==0){
if (i==0) res+=dp(s,id+1,smaller||(i<s[id]-'0'),10,10,0);
else res+=dp(s,id+1,smaller||(i<s[id]-'0'),i,10,1);
}
else{
if (i==t1||i==t2) continue;
res+=dp(s,id+1,smaller||(i<s[id]-'0'),i,t1,1);
}
}
f[id][smaller][t1][t2][st]=res;
return res;
}
int cal(int x){
memset(f,-1,sizeof(f));
string s=to_string(x);
return dp(s,0,0,10,10,0);
}
void solve(){
int ans=cal(r)-cal(l-1);
cout<<ans;
}
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
//freopen("254.inp","r",stdin);
//freopen(".out","w",stdout);
readData();
solve();
return 0;
}
/*
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o8888888o
88" . "88
(| -_- |)
0\ = /0
___/`---'\___
.' \\| |// '.
/ \\||| : |||// \
/ _||||| -:- |||||- \
| | \\\ - /// | |
| \_| ''\---/'' |_/ |
\ .-\__ '-' ___/-. /
___'. .' /--.--\ `. .'___
."" '< `.___\_<|>_/___.' >' "".
| | : `- \`.;`\ _ /`;.`/ - ` : | |
\ \ `_. \_ __\ /__ _/ .-` / /
=====`-.____`.___ \_____/___.-`___.-'=====
`=---='
*/
