#include <bits/stdc++.h>
using namespace std;
int a[15];
int ss(int n)
{
	memset(a,0,sizeof(a));
	int t = n,js = 0;
	while(t){
		js++;
		t /= 10;
	}
	while(n){
		a[n % 10]++;
		n /= 10;
	}
	for (int i = 0;i < js;i++)
	{
		if (a[i] != 1) return 0;	
	}
	return 1;
}
int main()
{
	int a1,b;
	cin >> a1 >> b;
	int js = 0;
	for (int i = a1;i <= b;i++)
	{
		if (ss(i))js++; 
	}
	cout << js << endl;
	return 0;
}