#include <bits/stdc++.h>
#define pb push_back
#define all(c) c.begin(),c.end()
#define f first
#define s second
using namespace std;
typedef long long ll;
const ll INF64 = 1e18 + 1337;
const int INF32 = 1e9 + 228;
const int MOD = 1e9 + 7;
void plusOne(string& s)
{
    s[s.length() - 1]++;
    int i = s.length() - 1;
    while(s[i] > '9')
    {
        if(i == 0)
        {
            string h = "1";
            for(int j = 0; j < s.length(); j++)
                h += "0";
            s = h;
            return;
        }
        s[i] = '0';
        s[i - 1]++;
        i--;
    }
}
ll formula(ll n, ll fd)
{
    ll res = 1;
    set<ll> divide;
    for(int i = 2; i <= n - 1; i++)
    {
        divide.insert(i);
    }
    for(int k = 10 - fd; k < 9 + n - fd; k++)
    {
        res *= k;
        set<ll> buf;
        for(auto& it : divide)
        {
            if(res % it == 0)
            {
                res /= it;
                buf.insert(it);
            }
        }
        for(auto& it : buf)
        {
            divide.erase(it);
        }
        res %= MOD;
        //cerr << n << " " << fd << " " << res << "\n";
    }
    return res;
}
int main()
{
    ios_base::sync_with_stdio(0);
#ifndef __WIN32
  ifstream cin("input.txt");
  ofstream cout("output.txt");
#endif
    cin.tie(0);cout.tie(0);

    string l, r;
    cin >> l >> r;
    ///move l to number like 10000000..
    ///move r to number like 9999999..
    if(r.size() <= 4)
    {
        ll ans = 0;
        while(l != r)
        {
            bool tooManyBooleans = 0;
            for(int i = 1; i < l.length(); i++)
            {
                if(l[i] < l[i - 1])
                {
                    tooManyBooleans = 1;
                    break;
                }
            }
            if(!tooManyBooleans) ans++;
            plusOne(l);
        }
        cout << ans;
        return 0;
    }
    bool gofuckyourself = 0;
    for(int i = 1; i < r.size(); i++)
    {
        if(r[i - 1] > r[i])
        {
            gofuckyourself = 1;
            break;
        }
    }
    if(gofuckyourself)
    {
        string buf = "";
        for(int i = 0; i < r.size() - 1; i++)
            buf += "9";
        r = buf;
    }
    ll sum = 0;
    for(int n = l.size(); n <= r.size(); n++)
    {
        ll st = 1, en = 9;
        if(n == l.size())
            st = l[0] - '0';
        if(n == r.size())
            en = r[0] - '0';
        for(int fd = st; fd <= en; fd++)
        {
            sum += formula(n, fd);
            sum %= MOD;
        }
    }
    cout << sum;


#ifndef __WIN32
  cin.close();
  cout.close();
#endif
    return 0;
}
///(9 + n - fd)!/((10 - fd)!*(n - 1)!)