// Starcraft 2 enjoyer //
#include <bits/stdc++.h>
// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
using namespace std;
#define LSOne(X) ((X) & -(X))
const int N = 4e5 + 5;
const int M = 1e6 + 5;
const int K = 19;
const int LG = 21;
const long long INF = 1e18 + 5;
const int C = 26;
const int B = 1000;
const int MOD = 998244353;
long long dp[19][11][11][2]; // dp[pos][secondlast][last][greater]
long long a, b;
string cur;
long long cal(int p, int sl, int l, bool smaller)
{
if (p < 0)
return 1;
if (dp[p][sl][l][smaller] != -1)
return dp[p][sl][l][smaller];
int i = smaller ? 9 : cur[p] - '0';
long long ans = 0;
for (int x = 0; x <= i; x++)
{
if (x == 0 && l == -1)
{
ans += cal(p - 1, 10, 10, smaller);
}
else
{
if (x == l || x == sl)
continue;
int ns = smaller | (x != i);
ans += cal(p - 1, l, x, ns);
}
}
return dp[p][sl][l][smaller] = ans;
}
long long get(long long a)
{
cur = to_string(a);
memset(dp, -1, sizeof(dp));
reverse(cur.begin(), cur.end());
return cal(cur.size() - 1, 10, 10, 0);
}
inline void solve()
{
cin >> a >> b;
cout << get(b) - get(a - 1) << "\n";
}
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int t = 1;
// cin >> t;
for (int x = 1; x <= t; x++)
{
solve();
}
return 0;
}
