/*
Template Version: 1.0.0 - 20220620
Author: Nguyen Tan Bao
Status:
Idea:
*/
#include <bits/stdc++.h>
#define FI first
#define SE second
#define ALL(a) a.begin(), a.end()
#define SZ(a) int((a).size())
#define MS(s, n) memset(s, n, sizeof(s))
#define FOR(i,a,b) for (int i = (a); i <= (b); i++)
#define FORE(i,a,b) for (int i = (a); i >= (b); i--)
#define FORALL(it, a) for (__typeof((a).begin()) it = (a).begin(); it != (a).end(); it++)
#define TRAV(x, a) for (auto &x : a)
using namespace std;
using ll = long long; using ld = double;
using pi = pair<int, int>; using pl = pair<ll, ll>; using pd = pair<ld, ld>;
using cd = complex<ld>; using vcd = vector<cd>;
using vi = vector<int>; using vl = vector<ll>;
using vd = vector<ld>; using vs = vector<string>;
using vpi = vector<pi>; using vpl = vector<pl>; using vpd = vector<pd>; // vector<pair>
template<class T> using min_pq = priority_queue<T, vector<T>, greater<T> >;
template<class T> inline int ckmin(T& a, const T& val) { return val < a ? a = val, 1 : 0; }
template<class T> inline int ckmax(T& a, const T& val) { return a < val ? a = val, 1 : 0; }
template<class T> void remDup(vector<T>& v) { sort(ALL(v)); v.erase(unique(ALL(v)), end(v)); }
constexpr int pct(int x) { return __builtin_popcount(x); } // # of bits set
constexpr int bits(int x) { return x == 0 ? 0 : 31-__builtin_clz(x); } // floor(log2(x))
constexpr int p2(int x) { return 1<<x; }
constexpr int msk2(int x) { return p2(x)-1; }
ll ceilDiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
ll floorDiv(ll a, ll b) { return a / b - ((a ^ b) < 0 && a % b); } // divide a by b rounded down
void setPrec(int x) { cout << fixed << setprecision(x); }
// TO_STRING
#define ts to_string
string ts(char c) { return string(1, c); }
string ts(const char* s) { return (string) s; }
string ts(string s) { return s; }
string ts(bool b) { return (b ? "true" : "false"); }
template<class T> using V = vector<T>;
template<class T> string ts(complex<T> c);
string ts(V<bool> v);
template<size_t sz> string ts(bitset<sz> b);
template<class T> string ts(T v);
template<class T, class U> string ts(pair<T,U> p);
template<class ...U> string ts(tuple<U...> u);
template<class T> string ts(complex<T> c) { stringstream ss; ss << c; return ss.str(); }
string ts(V<bool> v) {string res = "{"; FOR(i,0,SZ(v)-1) res += char('0'+v[i]); res += "}"; return res; }
template<size_t sz> string ts(bitset<sz> b) { string res = ""; FOR(i,0,SZ(b)-1) res += char('0'+b[i]); return res; }
template<class T> string ts(T v) { // containers with begin(), end()
bool fst = 1; string res = "";
for (const auto& x: v) { if (!fst) res += " "; fst = 0; res += ts(x); }
return res;
}
template<class T, class U> string ts(pair<T,U> p) { return "(" + ts(p.FI) + ", " + ts(p.SE) + ")"; }
template<size_t i, class T> string print_tuple_utils(const T& tup) { if constexpr(i == tuple_size<T>::value) return ")"; else return (i ? ", " : "(") + ts(get<i>(tup)) + print_tuple_utils<i + 1, T>(tup); }
template<class ...U> string ts(tuple<U...> u) { return print_tuple_utils<0, tuple<U...>>(u); }
// OUTPUT
template<class T> void pr(T x) { cout << ts(x); }
template<class T, class ...U> void pr(const T& t, const U&... u) { pr(t); pr(u...); }
void ps() { pr("\n"); } // print w/ spaces
template<class T, class ...U> void ps(const T& t, const U&... u) { pr(t); if (sizeof...(u)) pr(" "); ps(u...); }
// DEBUG
void DBG() { cerr << "]" << endl; }
template<class T, class ...U> void DBG(const T& t, const U&... u) { cerr << ts(t); if (sizeof...(u)) cerr << ", "; DBG(u...); }
#ifdef LOCAL_DEBUG
#define CONCAT(x, y) x##y
#define with_level setw(__db_level * 2) << setfill(' ') << "" << setw(0)
#define dbg(...) cerr << with_level << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#define chk(...) if (!(__VA_ARGS__)) cerr << setw(__db_level * 2) << setfill(' ') << "" << setw(0) << "Line(" << __LINE__ << ") -> function(" << __FUNCTION__ << ") -> CHK FAILED: (" << #__VA_ARGS__ << ")" << "\n", exit(0);
#define db_block() debug_block CONCAT(dbbl, __LINE__)
int __db_level = 0;
struct debug_block {
debug_block() { cerr << with_level << "{" << endl; ++__db_level; }
~debug_block() { --__db_level; cerr << with_level << "}" << endl; }
};
#else
#define dbg(...) 0
#define chk(...) 0
#define db_block() 0
#endif
const ld PI = acos(-1.0);
const int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1};
const ld EPS = 1e-9;
const ll MODBASE = 1000000007LL;
const int INF = 0x3f3f3f3f;
const int MAXN = 110;
const int MAXM = 1000;
const int MAXK = 16;
const int MAXQ = 200010;
ll dp[20][11][11][11][2][2];
ll solve(ll n) {
if (n == 0) return 1;
if (n < 0) return 0;
vi a;
while (n) {
a.push_back(n % 10);
n /= 10;
}
reverse(ALL(a));
int N = SZ(a);
MS(dp, 0);
dp[0][10][10][10][0][1] = 1;
FOR(i,0,N-1) {
FOR(last3,0,10) {
FOR(last2,0,10) {
FOR(last1,0,10) {
FOR(st,0,1) {
FOR(eq,0,1) {
if (dp[i][last3][last2][last1][st][eq] == 0) continue;
int Max = 9;
if (eq) Max = a[i];
FOR(num,0,Max) {
int newEq = eq;
if (num < Max) newEq = 0;
int newSt = st;
if (st == 0) {
newSt = (num > 0);
}
int newLast1 = num;
if (newSt == 0) newLast1 = 10;
if (last1 == newLast1 && last1 != 10 && newLast1 != 10) {
continue;
}
if (last2 == newLast1 && last2 != 10 && newLast1 != 10) {
continue;
}
dp[i+1][last2][last1][newLast1][newSt][newEq] += dp[i][last3][last2][last1][st][eq];
}
}
}
}
}
}
}
ll res = 0;
FOR(last3,0,10) {
FOR(last2,0,10) {
FOR(last1,0,10) {
FOR(eq,0,1) {
res += dp[N][last3][last2][last1][1][eq];
}
}
}
}
return res + 1;
}
int main() {
ios::sync_with_stdio(0);
cin.tie(nullptr);
ll l, r;
cin >> l >> r;
cout << solve(r) - solve(l-1);
return 0;
}
