#include<bits/stdc++.h>
using namespace std;
int a,b,s;
int main(){
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		int ls=i,w[10],j=0,pd=1;
		while(ls!=0){
			w[j]=ls%10;
			ls/=10;
			j++;
		}
		sort(w,w+j);
		for(int k=0;k<j;k++){
			if(w[k]!=k)pd=0;
		}
		if(pd){
			s++;
		}
	}
	cout<<s;
	return 0;
}