#include <bits/stdc++.h>
using namespace std;
int A[20], B[20];
long long f[20][11][11][2][2][2];
long long calc(int p, int prv1, int prv2, bool oka, bool okb, bool nonzero) {
long long &ret = f[p][prv1][prv2][oka][okb][nonzero];
if (ret != -1) return ret;
if (p == 18) return 1;
ret = 0;
int l, r;
l = 0, r = 9;
if (!oka) l = A[p];
if (!okb) r = B[p];
for (int i = l; i <= r; ++i) {
if (i == prv1 || i == prv2) continue;
if (!i && !nonzero) {
ret += calc(p + 1, 10, 10, oka | (i > l), okb | (i < r), 0);
}
else {
ret += calc(p + 1, i, prv1, oka | (i > l), okb | (i < r), 1);
}
}
return ret;
}
int main() {
ios::sync_with_stdio(false);
long long a, b; cin >> a >> b;
for (int i = 0; i < 18; ++i) A[17 - i] = a % 10, a /= 10;
for (int i = 0; i < 18; ++i) B[17 - i] = b % 10, b /= 10;
memset(f, -1, sizeof f);
cout << calc(0, 10, 10, 0, 0, 0);
}
