#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll a[20];
bool check(ll b)
{
	memset(a,0,sizeof a);
	ll len=0;
	while(b)
	{
		a[(b%10)]=1;
		len+=1;
		b/=10;
	}
//	cout<<len<<endl;
	ll x=len;
	for(ll i=0;i<x;i++)
	{
		len-=a[i];
	}
//	cout<<len<<endl;
	if(!len)
	{
		return 1;
	}
	return 0;
}
int main()
{
	//freopen(".in","r",stdin);
//	freopen("s.out","w",stdout);
//	cout<<check(103)<<endl;
//	cout<<a[0]<<" "<<a[1]<<endl;
//	return 0;
	ll n,m;
	cin>>n>>m;
	ll ans=0;
	for(ll i=n;i<=m;i++)
	{
		ans+=check(i);
	}
	cout<<ans;
	return 0;
 }