#include<bits/stdc++.h>
using namespace std;
int a,b,ans;
int main(){
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		int len=0,a[12]={},p=i,o=0;
		while(p!=0){
			a[p%10]++;
			len++;
			p/=10;
		}
		for(int j=1;j<=9&&o==0;j++){
			if(!((j<len&&a[j]==1)||(j>=len&&a[j]==0))) o=1;
		}
		if(o==0) ans++;
	}
	cout<<ans;
	return 0;
}