#include<bits/stdc++.h>
using namespace std;
int main(){
	int x=0,a,b,o,o2,v,ls,f;
	string s;
	cin>>a>>b;
	for(int i=a;i<=b;i++)
	{
		v=i;
		f=1;
		while(1){
			if(v==0)break;
			s+=char(v%10+'0');
			v=v/10;
		}
		sort(s.begin(),s.end());
		ls=s.size();
		o=int(s[0]-'0');
		o2=int(s[ls-1]-'0');
		for(int j=0;j<=ls-2;j++){
			if(char(s[j]+1)!=s[j+1])f=0;
		}
		if(o==0&&o2==ls-1&&f==1){
			x++;
		}
		s="";
	}
	cout<<x;
	return 0;
}