#include<bits/stdc++.h>
using namespace std;
//#define int long long
int a,b,ans;
vector<int> v;
bool check(int x){
	v.clear();
	while(x){
		v.push_back(x%10);
		x/=10;
	}
	sort(v.begin(),v.end());
	for(int i=0;i<v.size();i++){
		if(v[i]!=i)return 0;
	}
	return 1;
}
main(){
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(check(i))ans++;
	}
	cout<<ans<<"\n";
}