ll l, r;
    cin >> l >> r;
    ll f = l <= 9;
    ll num = 9;
    ll ans = 0;
    ll cnt = 1;
    while (r >= num)
    {
        r -= num;
        ans += num;
        num = num * 10 + 9;
        cnt++;
    }
    if (r) ans += r / cnt;
    num = 9;
    cnt = 1;
    ll ans1 = 0;
    while (l >= num)
    {
        l -= num;
        ans1 += num;
        num = num * 10 + 9;
        cnt++;
    }
    if (l) {
        ans1 += l / cnt;
        if (l % cnt && l > 1) ans1++;
    }
    cout << ans - ans1 + f;
    return 0;