#include<iostream>
using namespace std;
int a,b;
bool check(int x){
	bool y[20];
	for(int i = 0;i < 20;i++)y[i]=0;
	int cntt=0;
	while(x){
		if(y[x%10])return false;
		y[x%10]=1;
		x/=10;
		cntt++;
	}
	for(int i = 0;i < cntt;i++){
		if(!y[i])return false; 
	}
	
	return true;
}
signed main(){
	cin>>a>>b;
	int cnt=0;
	for(int i = a;i <=b;i++){
		cnt+=check(i);
	}
	cout<<cnt<<endl;
	return 0;
}