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