#pragma GCC optimize("O3,inline")
#include <bits/stdc++.h>
using namespace std;
string s;
vector<vector<vector<long long>>> mem, mem1;
long long dp(int n, int d1, int d2) {
if (n == -1) return 0;
if (mem[n][d1][d2] != -1) return mem[n][d1][d2];
long long res = 0;
for (int i = 0; i < 10; i++) {
if (i == d1 || i == d2) res += pow(10, n);
else res += dp(n - 1, i, d1);
}
return mem[n][d1][d2] = res;
}
long long dp1(int n, int d1, int d2) {
if (d1 == 0 && d2 == 10) d1 = 10;
if (n == -1) return 0;
if (mem1[n][d1][d2] != -1) return mem1[n][d1][d2];
long long res = 0;
for (int i = 0; i < s[n] - '0'; i++) {
if (i == d1 || i == d2) res += pow(10, n);
else res += dp(n - 1, i, d1);
}
if (s[n] - '0' == d1 || s[n] - '0' == d2) {
string s1 = (n == 0 ? "1" : s.substr(0, n));
reverse(s1.begin(), s1.end());
res += stoll(s1);
}
else res += dp1(n - 1, s[n] - '0', d1);
return mem1[n][d1][d2] = res;
}
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
mem.resize(18, vector<vector<long long>>(11, vector<long long>(11, -1)));
mem1.resize(18, vector<vector<long long>>(11, vector<long long>(11, -1)));
long long n1, n2;
cin >> n1; n1--;
s = to_string(max(0LL, n1));
reverse(s.begin(), s.end());
int s1 = s.size();
s += string(20 - s.size(), ':');
long long res1 = dp1(s1 - 1, 10, 10);
for (int i = 0; i < 18; i++) for (int j = 0; j < 11; j++) for (int k = 0; k < 11; k++) mem[i][j][k] = mem1[i][j][k] = -1;
cin >> s;
n2 = stoll(s);
reverse(s.begin(), s.end());
s1 = s.size();
s += string(20 - s.size(), ':');
long long res2 = dp1(s1 - 1, 10, 10);
cout << n2 - n1 - res2 + res1 << '\n';
}
