#include<bits/stdc++.h>
using namespace std;
long long cnt;
bool p(long long x)
{
	bool k[]={0,0,0,0,0,0,0};
	long long w=0;
	while(x!=0)
	{
		w++;
		k[x%10]=1;
		x=x/10;
	}
	for(long long i=0;i<w;i++)
	{
		if(k[i]==0)
			return false;
	}
	return true;
}
int main()
{
	freopen("p1.in","r",stdin);
	freopen("p1.out","w",stdout);
	long long a,b;
	cin>>a>>b;
	for(long long i=a;i<=b;i++)
	{
		if(p(i))
			cnt++;
	}
	cout<<cnt<<endl;
	return 0;
}