#include <bits/stdc++.h>
using namespace std;
int a,b,ans;
vector<int>v;
bool c[11];
bool lucky_number(int x){
	memset(c,0,sizeof(c));
	v.clear();
	while(x!=0){
		v.push_back(x%10);
		c[x%10]=1;
		x/=10;
	}
	for(int i=0;i<=v.size()-1;i++){
		if(c[i]==0)
			return false;
	}
	return true;
}
int main(){
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(lucky_number(i)==1)
			ans++;
	}
	cout<<ans<<endl;
	return 0;
}