#include<bits/stdc++.h>
using namespace std;
long long ans;
string s;
long long dp[20][10][10][20][2];
long long rec(int pos, int d1, int d2, int curpos, bool pref){
///cout << (int)s.size() << " " << pos << " " << d1 << " " << d2 << " " << curpos << " " << pref << " " << dp[pos][d1][d2][curpos][pref] << "\n";
if(pos >= (int)s.size()){
return 1;
}
if(dp[pos][d1][d2][curpos][pref] != -1){
return dp[pos][d1][d2][curpos][pref];
}
long long &cur = dp[pos][d1][d2][curpos][pref];
cur = 0;
int bound = (pref ? s[pos] - '0' : 9);
for(int i = 0; i <= bound; i++){
if(curpos == 0){
if(i){
cur += rec(pos + 1, i, 0, 1, (pref && bound == i));
}
else{
cur += rec(pos + 1, 0, 0, 0, (pref && bound == i));
}
}
else if(i != d1){
if(curpos >= 2 && i != d2){
cur += rec(pos + 1, i, d1, curpos + 1, (pref && bound == i));
}
else if(curpos == 1){
cur += rec(pos + 1, i, d1, curpos + 1, (pref && bound == i));
}
}
}
return cur;
}
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
long long a, b;
cin >> a >> b;
if(a == 0){
ans += 1;
}
else{
a -= 1;
}
s = to_string(b);
memset(dp, -1, sizeof(dp));
ans += rec(0, 0, 0, 0, true);
s = to_string(a);
memset(dp, -1, sizeof(dp));
ans -= rec(0, 0, 0, 0, true);
cout << ans;
}
