#include <bits/stdc++.h>
using namespace std;
void setup()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
}
int d[20], len;
long long f[20][20][100], a, b;
inline long long Form(int ind, int non_space, int cur, bool limit, long long num)
{
if (ind == -1)
{
// cout << non_space << " " << num << " " << cur << "\n";
return 1;
}
if (f[ind][non_space][cur] != -1 && !limit)
{
return f[ind][non_space][cur];
}
long long res = 0;
int nxt_non_space, nxt_cur;
bool nxt_limit;
for (int i = 0; i <= (limit ? d[ind] : 9); ++i)
{
if ((non_space == 0 || cur % 10 != i) &&
(non_space <= 1 || cur / 10 != i))
{
nxt_non_space = non_space + (non_space > 0 || i > 0);
nxt_cur = (cur % 10) * 10 + i;
nxt_limit = (limit & (i == d[ind]));
res += Form(ind - 1, nxt_non_space, nxt_cur, nxt_limit, num * 10 + i);
}
}
if (!limit)
{
f[ind][non_space][cur] = res;
}
return res;
}
inline long long G(long long inp)
{
len = 0;
do
{
d[len++] = inp % 10;
} while (inp /= 10);
for (int i = 0; i < 20; ++i)
{
for (int j = 0; j < 100; ++j)
{
for (int k = 0; k < 20; ++k)
{
f[i][k][j] = -1;
}
}
}
return Form(len - 1, 0, 0, 1, 0);
}
int main()
{
setup();
cin >> a >> b;
cout << G(b) - G(a - 1);
return 0;
}
