#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,ans=0;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		string s;
		stringstream o;
		o<<i;
		o>>s;
		if(s[0]=='0') continue;
		map<char,int> mp;
		int count=0;
		for(int j=0;j<s.size();j++){
			mp[s[j]]++;
			count++;
		}
		bool flag=true;
		for(char c='0';c<count+'0';c++){
			if(mp[c]!=1){
				flag=false;
				break;
			}
		}
		if(flag==true) ans++;
	}
	cout<<ans;
	return 0;
}