#include <bits/stdc++.h>
using namespace std;
int main()
{
	int n,m;
	cin>>n>>m;
	int z = 0;
	for (int i = n;i<=m;i++)
	{
		int a[110] = {0};
		int x = i;
		int c = 0;
		while (x!=0)
		{
			a[c] = x%10;
			x/=10;
			c+=1;
		}
		sort(a,a+c);
		int flag = 0;
		for (int j = 0;j<c;j++)
		{
			if (a[j]!=j)
			{
				flag = 1;
			}
		}
		if (flag==0)
		{
			z += 1;
		}
	}
	cout<<z;
	return 0;
}