#include<bits/stdc++.h>
using namespace std;
long long n,n2,sum;
int mmm(int y)
{
	int t[99]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
	int f=y,s=0;
	while(f)
	{
		s++;
		t[f%10]=1;
		f/=10;
	}
	for(int i2=0;i2<s;i2++)
	{
		if(t[i2]!=1)
			return 0;
	}
	return 1;
}
int main()
{
	cin>>n>>n2;
	sum=0;
	for(int i=n;i<=n2;i++)
	{
		if(mmm(i))
		{
			sum++;
		}
	}
	cout<<sum;
	return 0;
}