#include<bits/stdc++.h>
using namespace std;
int a, b, ans;
bool check(string x){
	sort(x.begin(), x.end());
	for(int i = 0;i < x.size();i++)
		if(x[i] - '0' != i)
			return 0;
	return 1;
}
int main(){
	cin>>a>>b;
	for(int i = a;i <= b;i++)
		if(check(to_string(i)))
			ans++;
	cout<<ans;
}