#include <bits/stdc++.h>
#define ll long long
using namespace std;

int a,b,cnt=0;

int check(int x){
	int f[15];
	int ln=0;
	int xx1=x;
	memset(f,0,sizeof(f));
	while(xx1 != 0){
		ln++;
		xx1/=10;
	}
	for(int i=0;i<=ln-1;i++){
		xx1 = x;
		while(xx1 != 0){
//			cout<<i<<' ';
			if(xx1%10 == i){
				if(f[i] == 0) f[i]++;
				else return 0;
			}
			xx1 /= 10;
		}
	}
	for(int i=0;i<=ln-1;i++){
//		cout<<f[i]<<" ";
		if(f[i] == 0) return 0;
	}
//	cout<<x<<" ";
	return 1;
}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);cout.tie(0);
	
	cin>>a>>b;
	
	for(int i=a;i<=b;i++){
//		cout<<check(i)<<"\n";
		if(check(i)) cnt++;
	}
	
	cout<<cnt;
	
	return 0;
}
/*/
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/*/