#include<bits/stdc++.h>
using namespace std;
int l,r,ans;
bool check(int n)
{
	string s=to_string(n);
	int len=s.size();
	bool vis[len]={0};
	for(int i=0;i<len;++i)vis[s[i]-'0']=1;
	for(int i=0;i<len;++i)if(!vis[i])return false;
	return true;
}
signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	cin>>l>>r;
	for(int i=l;i<=r;++i)if(check(i))ans++;
	cout<<ans;
	return 0;
}