#include <iostream>
using namespace std;
#define int long long
int dp[30][30][30][2];
int get(int x, int Ans = 0){
if (x < 10)
return x + 1;
string s = to_string(x);
for (int i=0;i<=20;i++){
for (int j=0;j<=11;j++)
for (int k=0;k<=11;k++)
for (int l : {0, 1})
dp[i][j][k][l] = 0;
}
dp[0][11][11][1] = 1;
int n = s.size();
for (int i=1;i<=n;i++){
int cur = s[i-1] - '0';
for (int j=0;j<=11;j++){
for (int k=0;k<=11;k++){
for (int d=0;d<10;d++){
if (d == j or d == k or (j + k == 22 and d == 0))
continue;
dp[i][k][d][0] += dp[i-1][j][k][0];
if (d == cur)
dp[i][k][d][1] += dp[i-1][j][k][1];
if (d < cur)
dp[i][k][d][0] += dp[i-1][j][k][1];
}
}
}
dp[i][11][11][0] = 1;
}
for (int j=0;j<=11;j++){
for (int k=0;k<=11;k++)
for (int l : {0, 1})
Ans += dp[n][j][k][l];
}
return Ans;
}
signed main(){
int a, b;
cin>>a>>b;
cout<<get(b) - get(a - 1)<<endl;
}
