#include<bits/stdc++.h>
using namespace std;
int w(int n)
{
	int s=0;
	while(n>0)
	{
		s++;
		n/=10;
	}
	return s;
}

int x[110],a,b;

int p(int n,int s)
{
	for(int i = 0;i <= 110;i++)x[i]=0;
	int g;
	while(n>0)
	{
		g=n%10;
		x[g]++;
		n/=10;
	}
	for(int i = 0;i <= s-1;i++)
	{
		if(x[i]==0)return 0;
	}
	return 1;
}

int main()
{
	int t=0;
	cin >> a >> b;
	for(int i = a;i <= b;i++)
	{
		if(p(i,w(i))==1)t++;
	}
	cout << t;
    return 0;
}