#include <bits/stdc++.h>
using  namespace std;
int pan(int n){
	long long c[1000009],i,j;
	i=1;
	while (n!=0){
		c[i]=n%10;
		n=n/10;
		i=i+1;
	}
	j=i;
	int b[j];
	for (i=0;i<j;i=i+1){
		b[i]=1;
	}
	for(i=0;i<j;i=i+1){
		b[c[i]]=0;
	}
	for (i=0;i<j;i=i+1){
		if(b[i]==1) return false;
	}
	return true;
}
long long cnt,i,a,b;
int main(){
	cin>>a>>b;
	cnt=0;
	for (i=a;i<=b;i=i+1){
		if(pan(i)) cnt=cnt+1;
	}
	cout<<cnt;
	return 0;
}