#include <bits/stdc++.h>
using namespace std;
int check(int a){
	vector<int> b;
	for (;a>0;a/=10){
		b.push_back(a%10);
	}
	sort(b.begin(),b.end());
	for (int i=0;i<b.size();i++){
		if (b[i]!=i){
			return 0;
		}
	}
	return 1;
}
int main() {
	int a,b,ans=0;
	cin>>a>>b;
	for (int i=a;i<=b;i++){
		ans+=check(i);
	}
	cout<<ans;
	return 0;
}