#include<bits/stdc++.h>
using namespace std;
int a[1000010],c,s;
void chai( int n )
{
	c = 1;
	while( n != 0 )
	{
		int d = n % 10;
		a[c] = d;
		c++;
		n /= 10;
	}
}
int main()
{
	int n,m,f;
	cin >> n >> m;
	for( int i = n; i <= m; i++ )
	{
		if( i <= 9 )
		{
			continue;
		}
		f = 1;
		chai(i);
		sort( a + 1,a + c );
		for( int j = 1; j <= c - 2; j++ )
		{
			if( a[1] != 0 || a[j] + 1 != a[j + 1] )
			{
				f = 0;
				break;
			}
		} 
		if( f == 1 ) 
		{
			s++;
		}
	}
	cout << s;
	return 0;
}