#include<bits/stdc++.h>
using namespace std;
string str(int a){
	string s="";
	while(a){
		int b=a%10;
		char c=b+'0';
		a/=10;
		s+=c;
	}
	reverse(s.begin(),s.end());
	return s;
}
int main(){
	int a,b,s=0;
	cin>>a>>b;
	string sss[7]={"0","01","012","0123","01234","012345","0123456"};
	for(int i=a;i<=b;i++){
		string ss=str(i);
		sort(ss.begin(),ss.end());
		if(ss==sss[ss.size()-1]){
			s++;
		}
	} 
	cout<<s;
	return 0;
}