#include<bits/stdc++.h>
#define int long long
using namespace std;
int a,b;
int cnt = 0;
signed main(){
	cin >> a >> b;
	for(int i = a;i <= b;i ++ ){
		bool flag = true;
		string s = to_string(i);
	    if(s[0] == '0')flag = false;
	    sort(s.begin(),s.end());
	    for(int j = 0;j < s.size();j ++ ){
		    if(s[j] != (j + '0'))flag = false;
	    }
	    cnt += flag;
	}
	cout << cnt << endl;
	return 0;
}