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

string strs[10] = {"", "0", "01", "012", "0123", "01234", "012345", "0123456", "01234567", "012345678"};

int main(){
	int l, r, cnt = 0;
	cin >> l >> r;
	for(int i = 1;i < 10;i++){
		do{
			if(stoi(strs[i]) >= l && stoi(strs[i]) <= r && to_string(stoi(strs[i])) == strs[i]) cnt++;
		}
		while(next_permutation(strs[i].begin(), strs[i].end()));
	}
	cout << cnt << "\n";
	return 0;
}