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

int main(){
	int a, b, res = 0; cin >> a >> b;
	for (int i = a; i <= b; i++)  {
		string s = to_string(i);
		vector<bool> v(s.size());
		for (char c : s) {
			v[c - '0'] = 1;
		}
		bool b = true;
		for (int i = 0;i < v.size() & b; i++) {
			if (!v[i]) b = false;
		}
		if (b) {
			res++;
		}
	}
	cout << res;
	return 0;
}