#include <bits/stdc++.h>
using namespace std;

long long cnt(long long r)
{

    long long tmp = r;
    long long k = 0, s = 0;
    while(tmp > 0)
    {
        k++;
        tmp /= 10;
    }

    if(k % 2 == 0)
    {
        long long a = r, b = 0;
        long long c = 1;

        for (long long i = 0; i < k / 2; i++)
        {
            b += (a % 10) * c;
            a /= 10;
            c *= 10;
        }

        if(a > b)
        {
            a--;
        }
        return a;
    }
    else
    {
        long long c = 1;
        for (long long i = 0; i < k / 2; i++)
        {
            s += (9 * c);
            c *= 10;
        }
        return s;
    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);

    long long l, r;

    cin >> l >> r;

    cout <<cnt(r) - cnt(l - 1);

    return 0;
}