#include <bits/stdc++.h>
using namespace std;
int a,b,cnt,f=1;
int main(){
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		int k=i,ws=-1,d[10]={0,0,0,0,0,0,0,0,0,0};
		while(k){
			d[k%10]=1;
			ws++;
			k/=10;
		}
		for(int j=0;j<=ws;j++){
			if(d[j]==1){
				f=1;
				continue;
			}else{
				f=0;
				break;
			}
		}
		if(f) cnt++;
	}
	cout<<cnt;
	return 0;
}