#include <bits/stdc++.h>
using namespace std;
#define fast ios::sync_with_stdio(0);cin.tie(0);
typedef long long ll;
#define f first
#define s second
#define MAXN 100005
#define int long long
ll count(string x) {
int len = x.length();
vector<vector<vector<int>>> dp(11, vector<vector<int>>(11, vector<int>(2, 0)));
dp[10][10][0] = 1;
for (int i = 0; i < len; i++) {
vector<vector<vector<int>>> new_dp(11, vector<vector<int>>(11, vector<int>(2, 0)));
for (auto smaller : {false, true}) {
for (int second_last = 0; second_last <= 10; second_last++) {
for (int last_digit = 0; last_digit <= 10; last_digit++) {
for (int digit = 0; digit < 10; digit++) {
if (!smaller && digit > x[i]-'0')
break;
if (digit == last_digit || digit == second_last)
continue;
new_dp[digit][last_digit][smaller || digit < x[i]-'0'] += dp[last_digit][second_last][smaller];
}
}
}
}
dp = new_dp;
}
ll ans = 0;
for (int second_last = 0; second_last <= 10; second_last++)
for (int last_digit = 0; last_digit <= 10; last_digit++)
ans += dp[last_digit][second_last][0] + dp[last_digit][second_last][1];
return ans;
}
signed main() {
fast
ll a, b;
cin >> a >> b;
if (a == 0) {
string strB = to_string(b);
cout << count(strB) << endl;
} else {
string strA = to_string(a-1), strB = to_string(b);
ll ans = count(strB) - count(strA);
cout << ans << endl;
}
}
