/* Problem URL: https://cses.fi/problemset/task/2220 */

#include <bits/stdc++.h>

using namespace std;

#define V vector

#define rmin(a, b) a = min(a, b)
#define rmax(a, b) a = max(a, b)

#define rep(i, lim) for (size_t i = 0; i < (lim); i++)
#define nrep(i, s, lim) for (size_t i = s; i < (lim); i++)

#define repv(i, v) for (auto &i : (v))
#define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; }
#define sortv(v) sort(v.begin(), v.end())
#define all(v) (v).begin(), (v).end()

using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vvvvi = vector<vvvi>;

using ll = long long;

using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
using vvvvl = vector<vvvl>;

template<class v>
auto operator<<(ostream &os, const vector<v> &vec)->ostream& {
    os << vec[0];
    for (size_t i = 1; i < vec.size(); i++) {
        os << ' ' << vec[i];
    }
    os << '\n';
    return os;
}

template<class v>
auto operator>>(istream &is, vector<v> &vec)->istream& {
    for (auto &i : vec) {
        is >> i;
    }
    return is;
}

template<class v>
auto operator<<(ostream &os, const vector<vector<v>> &vec)->ostream& {
    for (auto &i : vec) {
        os << i[0];
        for (size_t j = 1; j < i.size(); j++) {
            os << ' ' << i[j];
        }
        os << '\n';
    }
    return os;
}

template<class v>
auto operator>>(istream  &is, vector<vector<v>> &vec)->istream& {
    for (auto &i : vec) {
        for (auto &j : i) {
            is >> j;
        }
    }
    return is;
}

vvvvl memo;

void dec(int i, string &a)
{
    if (a[i] == '0') {
        a[i] = '9';
        dec(i - 1, a);
        return;
    }

    a[i] -= 1;
}

ll dp(int i, int prev, int started, int under, string &a)
{
    if (i >= memo.size()) {
        return 1;
    }

    ll &ans = memo[i][prev][started][under];
    if (ans != -1) {
        return ans;
    }

    ans = 0;

    for (char j = under ? 9 : a[i] - '0'; j >= 0; j--) {
        if (j != prev || !started) {
            ans += dp(i + 1, j, j != 0 || started, j < a[i] - '0' || under, a);
        }
    }

    return ans;
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    ll ai, bi;
    cin >> ai >> bi;
    string a = to_string(ai);
    string b = to_string(bi);

    memo.assign(b.size(), vvvl(10, vvl(2, vl(2, -1))));
    ll ans = dp(0, 0, 0, 0, b);
    if (a != "0") {
        dec(a.size() - 1, a);
        memo.assign(a.size(), vvvl(10, vvl(2, vl(2, -1))));
        ans -= dp(0, 0, 0, 0, a);
    }

    cout << ans << '\n';
}