#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define int long long
#define FOR(i, a, b) for (int i = a; i <= b; i++)
#define FORD(i, a, b) for (int i = b; i >= a; i --)
#define REP(i, n) for (int i = 0; i < n; ++i)
#define REPD(i, n) for (int i = n - 1; i >= 0; --i)
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void setupIO(){
#define name "Whisper"
//Phu Trong from Nguyen Tat Thanh High School for gifted student
srand(time(NULL));
cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
//freopen(name".inp", "r", stdin);
//freopen(name".out", "w", stdout);
cout << fixed << setprecision(10);
}
template <class X, class Y>
bool minimize(X &x, const Y &y){
X eps = 1e-9;
if (x > y + eps) {x = y; return 1;}
return 0;
}
template <class X, class Y>
bool maximize(X &x, const Y &y){
X eps = 1e-9;
if (x + eps < y) {x = y; return 1;}
return 0;
}
int l, r;
vector<int> a;
int dp[19][2][11][11][2];
int F(int pos, bool state, int pre_lst, int lst, bool zero){
if (pos == (int)a.size()) return 1;
int &ret = dp[pos][state][pre_lst][lst][zero];
if(~ret) return ret;
ret = 0;
int Lim = (state ? 9 : a[pos]);
for (int c = 0; c <= Lim; ++c){
if (c == pre_lst || c == lst) continue;
bool nxt_state = (state | (c < Lim));
int nxt_plst = pre_lst, nxt_lst = lst;
bool nxt_zero = (zero | (c > 0));
if(nxt_zero){
nxt_plst = lst;
nxt_lst = c;
}
ret += F(pos + 1, nxt_state, nxt_plst, nxt_lst, nxt_zero);
}
return ret;
}
int G(int x){
a.clear();
if (x < 0) return 0;
while (x > 0){
a.push_back(x % 10); x /= 10;
}
reverse(a.begin(), a.end());
memset(dp, -1, sizeof dp);
return F(0, 0, 10, 10, 0);
}
void Whisper(){
cin >> l >> r;
cout << G(r) - G(l - 1);
}
signed main(){
setupIO();
int Test = 1;
// cin >> Test;
for ( int i = 1 ; i <= Test ; i++ ){
Whisper();
if (i < Test) cout << '\n';
}
}
