#include<bits/stdc++.h>
using namespace std;
int a, b, s;
bool f;
signed main() {
	cin >> a >> b;
	for (int i = a; i <= b; i++) {
		string x = to_string(i);
		f = 0;
		sort(x.begin(), x.end());
		for (int j = 0; j < x.size(); j++) {
			if (int(x[j]) - 48 != j) {
				f = 1;
				break;
			}
		}
		if (!f) {
			s++;
		}
	}
	cout << s << "\n";
	return 0; 
}