#include <iostream>

using namespace std;

int main()
{
    long long r, l, time;
    long long result = 0;
    cin >> l >> r;
    time = r;
    int size = 0;
    while(time > 0){
        time /= 10;
        size += 1;
    }

    long long dp[101][10];
    for (int i = 0; i < size; ++i){
        for (int j = 0; j < 10; ++j){
            dp[i][j] = 0;
            if (i == 1 && j != 0){
                dp[i][j] = 1;
            }
        }
    }
    for (int i =  1; i < size; ++i){
        for (int j = 1; j < 10; ++j){
            for (int z = 9; z >= j; --z){
                dp[i][j] = (dp[i][j] + dp[i - 1][z]) % (1000000000 + 7);
            }
            result = (result + dp[i][j]) % (1000000000 + 7);
        }
    }
    cout << result;
    return 0;
}