/* p1.cpp

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

//guzixi ak csp-j
//guzixi ak csp-s
//guzixi ak noip
//guzixi ak shenxuan
//guzixi ak noi
//guzixi ak wc
//guzixi ak ctsc
//guzixi ak ioi
//guzixi ak xxywl

//while(1) rp+=1145141919810;
#include <bits/stdc++.h>
//#include <bits\stdc++.h>
using namespace std;
int m[15]={0,1,2,3,4,5,6,7,8,9},n[15];
int a,b,c,s;
bool f;
void cal(int x){
	memset(n,0,11*4);
	c=0;
	f=1;
	while(x>0){
		n[c++]=x%10;
		x/=10;
	}
}
int main(){
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		cal(i);
		sort(n,n+c);
		for(int j=0;j<c;j++)if(m[j]!=n[j]){
			f=0;
			break;
		}
		if(f)s++;
	}
	cout<<s;
	return 0;
} 
void mian();
void man();
//guzixi luogu uid = 1124559, welcome
//love ccf, love jiangsu
//ac p1 at 13:25