#include<bits/stdc++.h>
using namespace std;
int a,b,e[1001],c,d,sum;
bool flag;
int main(){
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		memset(e,0,sizeof(e));
		d=0,c=i,flag=1;
		while(c)
		  e[++d]=c%10,c/=10;
		sort(e+1,e+1+d);
		for(int j=1;j<=d;j++)
		  if(e[j]!=j-1)
		    flag=0;
		if(flag==1)
		  sum++;
	}
	cout<<sum;
	return 0;
}